Please help me with he following questions.

1.

MULTIPLE CHOICE. Choose the option or options that best answer the situtation. 1 point each. y The figure shows the velocity of a particle as it travels along the x-axis. What is the direction of the acceleration at r = 0.5 s? vx(m/s) T A t(s) -2+ A) in the -x direction B) in the +x direction 9) The acceleration is zero. 2) Suppose you are playing hockey on a new-age ice surface for which there is no friction between the ice and the hockey puck. You wind up and hit the puck as hard as you can. After the puck loses contact with your stick, the puck will AT speed up a little, and then slow down. B) start to slow down. C) speed up a little, and then move at a constant speed. D) not slow down or speed up. 3) A string is attached to the rear-view mirror of a car. A ball is hanging at the other end of the string. The car is driving around in a circle, at a constant speed. Which of the following lists gives all of the forces directly acting on the ball? A) tension, gravity, and the centripetal force B) tension C) tension, gravity, the centripetal force, and friction Dytension and gravity4) A ball is tossed vertically upward. When it reaches its highest point (before falling back downward) A) the velocity is zero, the acceleration is zero, and the force of gravity acting on the ball is zero. B) the velocity, acceleration, and the force of gravity on the ball all reverse direction. C) the velocity and acceleration reverse direction, but the force of gravity on the ball remains downward. DJ the velocity is zero, the acceleration is directed downward, and the force of gravity acting on the ball is directed downward. E) the velocity is zero, the acceleration is zero, and the force of gravity acting on the ball is directed downward. 5) Suppose a highway curve is properly banked to eliminate friction for a speed of 45 mph. If your tires were bald and you wanted to avoid sliding on the road, you would have to drive AT somewhat below 45 mph. B) somewhat above 45 mph. C) at exactly 45 mph. 6) Two men, Joel and Jerry, push against a wall. Jerry stops after 10 min, while Joel is able to push for 5.0 min longer. Compare the work they do. A) Both men do positive work, but Joel does 25% more work than Jerry. B) Both men do positive work, but Joel does 50% more work than Jerry. C) Both men do positive work, but Joel does 75% more work than Jerry. D) Both men do positive work, but Jerry does 50% more work than Joel. E) Neither of them does any work. 7) The plot in the figure shows the potential energy of a particle, due to the force exerted on it by another particle, as a function of distance. At which of the three points labeled in the figure is the magnitude of the force on the particle greatest? 0+ Potential Energy N+ - X Distance A) point X B) point Y A point Z 2$) A small car has a head-on collision with a large truck. Which of the following statements concerning the magnitude of the average force due to the collision is correct? The truck experiences the greater average force. B) The small car and the truck experience the same average force. C) The small car experiences the greater average force. D) It is impossible to tell since the masses are not given. E) It is impossible to tell since the velocities are not given. ) In an INELASTIC collision between two objects A) the kinetic energy of the system is conserved, but the momentum of the system is not conserved. B) both the momentum and the kinetic energy of the system are conserved. C) the momentum of each object is conserved. D) the momentum of the system is conserved but the kinetic energy of the system is not conserved. E) the kinetic energy of each object is conserved. 10) You are standing on a skateboard, initially at rest. A friend throws a very heavy ball towards you. You can either catch the object or deflect the object back towards your friend (such that it moves away from you with the same speed as it was originally thrown). What should you do in order to MINIMIZE your speed on the skateboard? A) Deflect the ball. B Catch the ball. C) Your final speed on the skateboard will be the same regardless whether you catch the ball or deflect the ball. ORT ANSWER. Solve for the unknown in the problem using your understanding of physics. Show all your work, ly, and box in your answer. 3 points each. 11) A car is 200 m from a stop sign and traveling toward the sign at 40.0 m/s. At this time, the driver suddenly realizes that they must stop the car. If it takes 0.200 s for the driver to apply the brakes, what must be the magnitude of the constant acceleration of the car after the brakes are applied so that the car will come to rest at the stop sign? ( 4010 1x/s + 200 m ) . = 120 Sec XO. 200 see 240 2 = 24 Sec