Question

starting from a stationary position, Rahul paddles his bicycle to attain a velocity of 6m/s in 30s. Then he applies brakes such that the velocity of the bicycle comes down to 4m/s 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=− 2/5

a=−0.4m/s^2

Answer 2

Explanation:

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