Question

help! im timed. A ball is thrown downward with an initial velocity of 12.1 m/s. How long will it take to reach a velocity of -24.5 m/s?

Answer 1

`1.27\:\text{s}`

Step-by-step explanation:

We can use the following kinematics equation to solve this problem:

`v_f=v_i+at`

Solving for
`t`:

`-24.5=-12.1+-9.8t,\\-12.4=-9.8t,\\t=(-12.4)/(-9.8)\approx \boxed{1.27\:\mathrm{s}}`