Question

A particle moves 8 seconds . It first accelerates from rest and then retards to rest . If the retardation be 3 times the acceleration then time for which it accelerated is?

Answer 1

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11th

Physics

Motion in a Straight Line

Acceleration

A particle moves for 8 seco...

PHYSICS

A particle moves for 8 seconds. It first accelerates from rest and then retards to rest. If the retardation be 3  times the acceleration, then time for which it accelerates will be 

A

2s

B

3s

C

4s

D

6s

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ANSWER

Let 't' be time of acceleration

Then retardation time =θ−t total time = 8 sec

[D]  Let V1 be velocity after acceleration 

let acceleration be a

V1=u+athereu=0V1=at→(i)

none retardation = 3a (given)

Hence,

V=V1−3a(8−t)V=0,V1=3a(8−t)at=3a(8−t),putV1from(i)t=24−3t4t=24t=6second

Explanation:

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