Question

A ball is thrown straight down with a velocity of 12 m/s; what will be its velocity 2.0 s after being released?

Answer 1

`v = 31.6m/s`

Step-by-step explanation:

Given

`Initial\ Velocity, u = 12m/s`

`Time, t = 2.0s`

Required

Determine the final velocity, v

Using the first equation of motion

`v = u + at`

But in this case;

a = g = acceleration of gravity

So:

`v = u + gt`

Substitute values for u and t

`v = 12 + g * 2`

`v = 12 + 2g`

Take g as 9.8m/s²

`v = 12 + 2 * 9.8`

`v = 12 + 19.6`

`v = 31.6m/s`

Hence, the velocity is 31.6m/s