Question

A child throws a tennis ball straight down with a speed of 14.8 m/s. It takes 1.5 seconds to reach the ground. What is its velocity when it reaches the ground?

Answer 1

-14.8 m/s

Step-by-step explanation:

Unless this is a trick question the initial velocity is 14.8 m/s. Velocity is a vector quantity, i.e. it has a magnitude AND direction. Speed which is a scalar is certainly 14.8 m/s. The direction of the vector depends on the axis of co-ordinates chosen; consequently velocity might be said to be - 14.8 m/s