A tired man has moved through x metres in t minutes. If $x = 80 t - 5 t^{2} .$ What is the time elapsed and distance covered, before he comes to rest ?

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10 sec; 350 m

8 sec; 300 m

12 sec; 400 m

8 sec; 320 m

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detailed solution

Correct option is D

v=dxdt=80−10t=0⇒t=8s⇒x=320m when t=8s

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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 tired man has moved through x metres in t minutes. If $x = 80 t - 5 t^{2} .$ What is the time elapsed and distance covered, before he comes to rest ?