Question

A motorcycle is moving with a velocity of 10ms^-1, seeing a roadblock at the front, he slowed down until it stops with 7 seconds. What is the deceleration of the motorcycle?

Answer 1

$$a=\dfrac{v-v_0}{t},$$ $$a=\dfrac{0-10\ \dfrac{m}{s}}{7\ s}=-1.43\ \dfrac{m}{s^2}.$$