Question

starting from rest Nikita paddles her bicycle to attain a velocity of 5m/s in 25s then she applies brakes so 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

Here it is......
Hope this will help you ...
If it helps you then mark as brilliant.. ;-)

Answer 2

Answer:

a1=0.2. a2=-0.2

Explanation:

starting from rest so intial speed of bicycle is 0.

now she paddles to attain a speed of 5ms.

then by v=u+at

5=0+a(25)

a=5/25

a=1/5

a=0.2 m/s2. (first case)

now brakes are applied so v becomes 4 m/s

so 4=5+a(5)

a=-1/5

a=-0.2m/s2

As its acceleration or braking acceleration is negative