A student riding on a train that moves east at a constant velocity tosses a ball…
PHYSICS · Single correct · AP · Physics 1: Algebra-based · Kinematics · Kinematics
Problem
A student riding on a train that moves east at a constant velocity tosses a ball straight upward and catches it moments later in the same spot relative to the train. Which statement best explains why the ball returns to the student’s hand?
(a) At the top of its flight the ball’s velocity is zero in every direction, so it simply drops straight back to the student.
(b) Air resistance inside the train pushes the ball forward, keeping it above the same spot relative to the student.
(c) The ball retains the train’s horizontal velocity, so its path is vertical relative to the student even though it follows a curved trajectory relative to Earth.
(d) The student’s hand imparts a forward force that continues throughout the ball’s flight, ensuring it moves with the train.