A Smart Car, which has a mass of 1000 kg, is going 20 m/s. When it hits the barrier, it stops with a time of 0.5 seconds. What is the force on the car?

40000N

Explanation:

Given parameters:

Mass of the car = 1000kg

Velocity of the car  = 20m/s

Time taken  = 0.5s

Unknown:

Force on the car  = ?

Solution:

According to Newtons second law of motion:

 F = m a

F is the force

m is the mass

 a is the acceleration

 F = m  

 Change in velocity  =  0 - 20  = -20m/s

 F = 1000 x  = -40000N

The force on the car is 40000N

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