CBSE Class 9 Answered
Starting from rest, an object is uniformly accelerated to a speed of 60m/s in 20s. The object travels with this speed for next 40s and is then brought to rest by a uniform retardation in the next 30s.Sketch velocity time graph and calculate the acceleration, retardation and the total distance travelled.
Hint: acceleration =rate of change of velocity. distance covered =area under velocity-time graph .