# Question

In Exercise 71, what are the relative velocities if the ball is thrown in the direction of the truck?

In exercise A person riding in the back of a pickup truck traveling at 70 km/h on a straight, level road throws a ball with a speed of 15 km/h relative to the truck in the direction opposite to the truck’s motion. What is the velocity of the ball?

(a) Relative to a stationary observer by the side of the road, and

(b) Relative to the driver of a car moving in the same direction as the truck at a speed of 90 km/h?

In exercise A person riding in the back of a pickup truck traveling at 70 km/h on a straight, level road throws a ball with a speed of 15 km/h relative to the truck in the direction opposite to the truck’s motion. What is the velocity of the ball?

(a) Relative to a stationary observer by the side of the road, and

(b) Relative to the driver of a car moving in the same direction as the truck at a speed of 90 km/h?

## Answer to relevant Questions

In a 500-m stretch of a river, the speed of the current is a steady 5.0 m/s. How long does a boat take to finish a round trip (upstream and downstream) if the speed of the boat is 7.5 m/s relative to still water? It is raining, and there is no wind. When you are sitting in a stationary car, the rain falls straight down relative to the car and the ground. But when you’re driving, the rain appears to hit the windshield at an angle. ...An airplane is flying at 150 mi/h (its speed in still air) in a direction such that with a wind of 60.0 mi/h blowing from east to west, the airplane travels in a straight line southward. (a) What must be the plane’s ...A 75.0-kg person is standing on a scale in an elevator. What is the reading of the scale in newtons if the elevator is (a) At rest, (b) Moving up at a constant velocity of 2.00 m/s, and (c) Accelerating up at 2.00 m/s2? (a) An Olympic skier coasts down a slope with an angle of inclination of 37o. Neglecting friction, there is (are) (1), one, (2) two, (3) three force(s) acting on the skier. (b) What is the acceleration of the skier? (c) If ...Post your question

0