Question

A ball is thrown straight up in the air. At its highest point (A) the velocity and acceleration are zero. (B) the velocity is non zero but the acceleration is zero. (C) the acceleration is non zero but the velocity is zero. (D) the velocity and acceleration are both non zero

Answer 1

at the highest point acceleration is non zero but velocity is zero

Answer 2

The answer is C) The accleration is non zero but velocity is zero.

Explaination:

We know, At highest point,

Final velocity, V = 0 in time t and initial velocity u

Now, a = (v-u)/t = 0-u/t = -u/t which is not equal to zero.