Question

If a body is moving with 72 kmph velocity after 4s its speed is 36 kmph then find retardation of a body?

Answer 1

Answer:

s=

2a

v

2

−u

2

=

2(−0.5×10)

0

2

−(20)

2

=

10

400

=40m

Answer 2

Answer:

-2.5 m/s^2

Explanation:

Initial Velocity = 20 m/s

Initial Velocity = 20 m/sFinal velocity = 10 m/s

Initial Velocity = 20 m/sFinal velocity = 10 m/sTime = 4s

Initial Velocity = 20 m/sFinal velocity = 10 m/sTime = 4sacceleration = (Final velocity - Initial Velocity)/time