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Q.

A tired man has moved through x metres in t minutes. If x=80t−5t2. What is the time elapsed and distance covered, before he comes to rest ?

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a

10 sec; 350 m

b

8 sec; 300 m

c

12 sec; 400 m

d

8 sec; 320 m

answer is D.

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Detailed Solution

v=dxdt=80−10t=0⇒t=8s⇒x=320m when t=8s
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