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(a) A body starting from rest moves with...

(a) A body starting from rest moves with a constant acceleration of `5 m//s^(2)`. What is velocity of the body after `10 sec` ?
(b) A scooter moving with a velocity of `18 km//h` is brought to rest in `5 s` by applying brakes. What is the acceleration produced ?

A

50 m/s , -1 units

B

25 m/s , 0.9 units

C

50 m/s, 0.1 units

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
(a) From `v=u + at`, `v = 0+5 xx 10 = 50 m//s`
(b) Here, `u = 18 km//h = (18 xx 1000 m)/(60 xx 60 s) = 5 m//s`
`v = 0, t=5s`.
From `v = u+at`
`0=5+a xx 5, a = -1 m//s^(2)`
Negative sign indicates retardation.
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