Question

A car standing from rest accelerates uniformly and attends a speed of 60ms-1 in 30 seconds. It then slows down uniformly until it comes to rest in the next 20 seconds. Sketch the velocity time graph for the motion of the car

Answer 1

Acceleration during the first 30 seconds is $a_1 = \frac{60m/s}{30s} = 2 \frac{m}{s^2}$ and during the next 20 seconds is $a_2 = \frac{-60m/s}{20s} = -3 \frac{m}{s^2}$.