Question

A ball was kicked by a player, the ball was stationary, then it gains a velocity of 5 m/s North. Did the ball accelerate or no? How can you tell?

Answer 1

Answer:

Yes, it accelerates

Explanation:

We have that:

The ball was stationary implies that its initial velocity, u = 0

It gained 5m/s means that its final velocity, v = 5m/s

Using first law of newton, we can determine whether it accelerates or not.

$v = u + at$

Substitute values for v and u

$5 = 0 + at$

$5 = at$

Make a the subject

$a= \frac{5}{t}$

This implies that the ball accelerates over a period of time t

Another way to tell if it accelerates or not is to consider the change in velocity.

When there is an increment in velocity of an object, the object accelerates.

In this case, the velocity increases from 0 to 5. Hence, we can conclude that it accelerates