1. An object starting from rest moves down a frictionless incline with an acceleration of 2.00 m/s2 for 2.00 seconds. What acceleration-time graph best represents the motion of the object? 2. A snowboarder starts from rest and travels 50 m down a half-pipe with constant acceleration for 10s. Her acceleration during this time is? 3. An object accelerates from 10.0 m/s to 60.0 m/ s in 4.00 s. The magnitude of the acceleration is? 4. A marble was rolled up an inclined plane with an initial speed of 16 cm/s. As it rises up the incline it experiences a uniform deceleration of 4.0 cm/s?. At what time was it a distance of 30 cm up the inclined plane? 5. How long will it take an arrow to return to its point of firing if it is shot straight up with an initial speed of 54 m/s? 6. A skier accelerates at 5.00 m/s down a 20.0 m long slope. If his initial speed was 5.00 m/s, his final speed is? . A river flows east at 5.00 m/s. A boat which can travel at 12.0 m/s on still water heads straight north across the river. a. The resultant direction of the boat is b. The magnitude of the resultant velocity is 3. A tourist is visiting the English countryside by car. He travels straight on country highway for 8.00 km at 100 km/h, then through a town for another 5.00 km at 60.0 km. The average speed of the car is? . If the tension in a string attached to an apple is equal to the force of gravity acting on the apple, which of the following statements are possible concerning the motion of the apple? a. It is moving upward at a constant speed. b. It is moving downward at a constant speed. c. It is stationary. 10. A force of 12 N is applied to an object. If the frictional force on the object is 8.0 N, the net force is? 11. Block A has a mass of 10 kg and block B has a mass of 20 kg. The pulley is frictionless but block B experiences a friction force of 20 N. What is the acceleration of the system? 12. Ozzy Osbourne, whose mass is 100 kg, is standing on a set of spring scales in an elevator while it is accelerating up at 2.00m/s^2 to the penthouse suite of a hotel. The reading on the scales is? 13. An 1800 kg automobile travelling at 60.0 km/h impacts into a concrete barrier and stops in 4.20 x 10^-1 s. The collision force on the automobile is? 14. The diagram represents a view from above a flat circular track whose radius is 200 m. Racing car X is moving around the track at a uniform speed of 40 m/s. The mass of the car is 2.0 * 10^3 kg a. The magnitude of the car's acceleration is b. The magnitude of the centripetal force is c. If the coefficient of friction between the tires of car X and the road was only 0.30, what would be the maximum speed at which a car could travel safely around the track