train moving brought to rest within 20 seconds by applying brakes find the initial velocity if the return reason due to the brakes is 2 metre per square second
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v=0
a= -2m/s^2
t = 20sec
v=u+at
0=u+(-2×20)
0= u - 40
40 m/s =u
a= -2m/s^2
t = 20sec
v=u+at
0=u+(-2×20)
0= u - 40
40 m/s =u
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