Question

A person runs with an initial velocity of 5.0 m/s. Then he slows down at a constant rate of -1.2 m/s² over a period of 3 seconds. What is his velocity at the end of time.

Answer 1

$a=\frac{v_2-v_1}{t}=1.2$ m/s²

$v_2=v_1+at=5-1.2\cdot 3=1.4$ m/s