Question

A 50 kg object accelerates uniformly from rest to a speed of 10.0 m/s in 0.5 seconds. The object's acceleration is ___.

Answer 1

By definition, the acceleration is:

$$a = \dfrac{v_f-v_i}{t}$$

where $v_f = 10m/s$ is the final velocity, $v_i = 0m/s$ is the initial velocity (started from rest), and $t=0.5s$ is the the time interval. Thus, the acceleration will be:

$$a = \dfrac{10m/s-0m/s}{0.5} = 20m/s^2$$

Answer. 20 m/s^2.