Question

Starting from a stationary position, Rahul paddles his bicycle to attain a velocity of 6 ms–1 in 30 s. Then he applies brakes such that the velocity of the bicycle comes down to 4 ms-1 in the next 5s. Calculate the acceleration of the bicycle in both the cases.

Answer 1

For first case:

Initial velocity =0

Final velocity =60m/s

Time =30sec

v=u+at

6=0+a×30

6=30a

a=

30

6

=0.2

a=0.2m/s

2

For second case:

Initial velocity =6m/s

Final velocity =4m/s

Time taken =5sec

v=u+at

4=6+a×5

4−6=5a

−2=5a

a=−

5

2

a=−0.4m/s

2

Answer 2

Answer:

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Explanation:

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