Question

10. Starting from rest, Rahul paddles his cycle to attain a velocity of 6m/s in 30 s. He then applies brakes such that the velocity of the bicycle comes down to 4 m/s in the next 5 s. Calculate the acceleration of the bicycle on both the cases.

Answer 1

Answer:

A:- v=u+at

6=0+a*30

30a= 6

6

a=----

30

a=0.2

B:-. v=u+at

4=6+a*5

5a+6=4

5a= -2

-2

a=------

5

a=-0.4

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Answer 2

Explanation:

in first case :-

starting from A stationary position u = 0

v = 6m/s

time , t = 30 sec

a = v - u / t

a = 6 m/s - 0 m/s \ 30 sec

a = 0.2 m/s

In second case :-

u = 6 m/s

v = 4 m/s

t = 5 sec

a = v - u / t

a = 4 m/s - 6 m/s \ 5 sec

a = 0.4 m/s