A car is moving with the speed of 60m/s and come to the rest after applied the break in 20sec. then retardation of the car will be
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u = 60m/s
v = 0
a = ?
t = 20 sec
a = (v² - u²)/t
a = (0 - 60)/20
a = -60/20
a = -30m/s²
Therefore retardation is 30m/s²
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