CBSE Class 9 Answered
(a) Draw velocity–time graph for the following cases.
(i) When the object is at rest
(ii) When the object is thrown vertically upwards
(b) A motorcyclist riding motorcycle A, travelling at 36 km/h applies the brakes and stops the motorcycle in 10 s. Another motorcyclist of motorcycle B travelling at 18 km/h applies the brakes and stops the motorcycle in 20 s. Plot speed-time graphs for the two motorcycles. Which of the two motorcycles travelled farther before coming to a stop?
Asked by Topperlearning User | 15 Jun, 2016, 01:29: PM
Expert Answer
(a)
(i)
(ii)
(b) For motorcycle A,
u = 36 km/h = 36 x 5/18 = 10 m/s
v = 0; t = 10 s
For motorcycle B,
u = 18 km/h = 18 x 5/18 = 5 m/s
v = 0; t = 20 s
Distance travelled by A before stopping = Area of triangle OPQ
= ½ x 10 x 10 = 50 m
Distance travelled by B before stopping = Area of triangle OMN
= ½ x 20 x 5 = 50 m
Hence, both motorcycles travel the same distance before they come to a stop.
Answered by | 15 Jun, 2016, 03:29: PM
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