Relative velocity is the pace at which an object's position changes in relation to time is its velocity. The relative velocity of an item is measured in relation to an observer in motion, whereas the velocity of an object is typically measured in relation to a stationary object.
The ball's speed in relation to a moving truck is, Vbt = 70 m/s
(Considering the direction the ball is thrown in as a positive direction)
The ball's speed in relation to a stationary observer is, Vb = 30 m/s
Let the truck's speed to be, Vt
The following equations can be used to calculate the ball's relative velocity to the truck:
Vbt = Vb - Vt
70 = 30 - Vt
Vt = -40 m/s
(The truck is driving in the opposite direction to the direction in which the ball is thrown, as shown by the negative sign here.)
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I understand that the question you are looking for is "A baseball pitcher can throw a ball with a speed of 70 m/s . He is in the back of a pickup truck that is driving away from you. He throws the ball in your direction, and it floats toward you at a lazy 30 m/sWhat is the speed of the truck?"