Question

Starting from a stationary position mayur paddles his bicycle to attain a
velocity of 10km h-1 in 20 s. Then he applies breaks such that the velocity
comes down to 5 km h-1 in the next 6 s. Calculate the acceleration of
bicycle in both the cases.

Answer 1

Explanation:

Answer

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