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A car begins from rest at t=0,& then accelerates along a straight track during the interval 0 a) 0.2 b) 0.3 c) 0.4 d) 0.5 ans = (c)

A car begins from rest at t=0,& then accelerates along a straight track during the interval 0a) 0.2
b) 0.3
c) 0.4
d) 0.5
ans = (c)
4765-1776_6545_untitled1.jpg

Grade:12

1 Answers

anandpal shekhawat
8 Points
12 years ago
hi as V=2t^2 so, A=dV/dt= 4t as coin started moving at t=1s implies at this instant force acting on it has overcome the static friction & F=mA =4N at t=1s hence coeff. of friction = 4/g =0.4

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