A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is
A)zero.
B)less than 30 m/s but more than zero.
C)about 30 m/s.
D)more than 30 m/s.

Question

Quizplus · Accepted Answer

In the absence of air resistance, the horizontal component of the velocity of a projectile (or any object in free fall) remains constant because no horizontal force is acting on it. Therefore, if the package falls off a truck moving at 30 m/s, its horizontal speed just before hitting the ground will still be about 30 m/s.

A Package Falls Off a Truck That Is Moving at 30