A car of mass of 1000 kg moving with a velocity of 54 km/h stops in 5 seconds. What is the force applied by brakes?

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2500 N

2000 N

3000 N

3500 N

answer is C.

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Detailed Solution

It is given that
Final velocity, v = 0 km/h = 0 m/s
Initial velocity, v = 54 km/h = 15 m/s
Mass, m = 1000 kg
Time, t = 5 s
Let the force be denoted by ‘F’.
Now, the force is given by
=> F = m(v - u) / t
=> F = 1000(0 - 15) / 5
=> F = -3000 N

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