Question

A car accelerates for 5 seconds at 2.1 m/s squared if the car initially had a speed of 10 m/s what is its new speed?

Answer 1

Note that velocity is measured in meters per second (m/s) and acceleration is in meters per second squared ($\frac{m}{s^2}$)

Our initial velocity is 10 m/s and then the car accelerated for 5 seconds at 2.1 $\frac{m}{s^2}$\\

Note that $a=\frac{velocity}{time} \\v=acceleration * time\\v=(2.1\frac{m}{s^2})*(5s)\\ v=10.5 \frac{m}{s}$

So our final velocity is our initial velocity + a*t;

$v = (10+10.5)\frac{m}{s} \\v=20.5\frac{m}{s}$