NCERT Exercise 2.8 - Motion in a Straight Line
Question: A ball is dropped from a height of 90 m on a floor. At each collision with the floor, the ball loses one tenth of its speed. Plot the speed-time graph of its motion between t = 0 to 12 s.
Answer: Speed-time graph: V-shaped segments; first impact speed = **42 m/s**; each bounce retains **90%** of speed.
Full step-by-step NCERT solution with diagrams on Something by Zero.