a moving train brought to rest within 20 seconds by applying brakes . Find the initial velocity, if the retardation due to brakes is 2 ,metre /second
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v = 0
t = 20 secunds
a = -2m/s^2
u = ?
2as = v² - u²
=> 2 × -2 × 20 = 0 - u²
=> -80 = -u²
=> u = √80
=> u = 8.9m approkcimateli
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