What is the force required to accelerate a 4 kg rock from 3 m/s to 15 m/s in seconds?

16 Newtons

Explanation:

We will use the equation F=ma

First, find the acceleration using the givens.

a=∆v/∆t

a=15-3/3

a=12/3

a=4 m/s^2

Next, plug the acceleration and mass into the equation.

F=ma

F=4kg (4m/s^2)

F=16 Newtons