Question

5. Starting from stationary position, dev paddles his bicycle to
attain a velocity of 6 m/s in 30 s. Then he applies brakes
such that the velocity of the bicycle come down to 4 m/s in
the next 5 s. calculates the acceleration of the bicycle in
both cases.
(2)​

Answer 1

Answer:

CASE I

Given,

Initial Velocity(u)=0m/s

Final Velocity(v)=6m/s

time(t)=30 secs

Acceleration=?

v=u +at

v=0+a(30)

6=0+a(30)

6-0=a(30)

6/30=a

a=1/5 m/s-2

a=0.2m/s-2

CASE II

Given,

Initial Velocity(u)=6m/s

Final Velocity(v)=4m/s

time(t)=5 secs

acceleration=?

v=u+at

4=6+a(5)

4-6=a(5)

-2/5=a

a=-0.4m/s-2.