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neeraj pawar Grade: 12
        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
7 years ago

Answers : (1)

anandpal shekhawat
8 Points
										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
7 years ago
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