The time required to stop a car of mass 800 kg, moving at a speed of 20 m/s over a distance of 25 m is
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Explanation:
The time required to stop a car of mass 800 kg, moving at a speed of 20 m/s over a distance of 25 m is
1800kg
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u = 20 m/s
v = 0
s = 25m
v^2 - u^2 = 2as
0 - 20^2 = 2×a×25
-400 = 50a
a = -400/50 = -8 m/s^2
v = u + at
0 = 20 - 8t
8t = 20
t = 20/8 = 2.5 second
It will need 2.5 second to stop the car
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