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Questions  

A tired man has moved through x metres in t minutes. If x=80t5t2. What is the time elapsed and distance covered, before he comes to rest ?

a
10 sec; 350 m
b
8 sec; 300 m
c
12 sec; 400 m
d
8 sec; 320 m

detailed solution

Correct option is D

v=dxdt=80−10t=0⇒t=8s⇒x=320m when t=8s

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