A cart loaded with sand slides forward along a horizontal frictionless track.As the cart moves, sand trickles out at a constant rate through a hole in the back of the cart.The acceleration of the cart is:
A)constant and in the forward direction
B)constant and in the backward direction
C)variable and in the forward direction
D)variable and in the backward direction
E)zero

Question

Quizplus · Accepted Answer

Since the track is frictionless and no external horizontal forces are acting on the cart, the acceleration of the cart is zero. The loss of sand does not affect the horizontal motion of the cart.

A Cart Loaded with Sand Slides Forward Along a Horizontal