Question

A moving car is brought into rest within 15 seconds by applying brakes. Find the initial velocity if the retardation due to brakes is 3 m/s

Answer 1

v=0
u=?
a=3m/s
t=15 sec
now we know that v=u+at
ATP,
0=u + 15*3

0=u + 45
u=45m/s

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