In a safety test, a car of mass 1000 kg is driven into a brick wall. Its bumper
behaves like a spring (k = 5 x 1000000 Nm-1) and is compressed by a distance of
3 cm as the car comes to rest. Determine the initial speed of the car.
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Here the kinetic energy of the car is stored in the spring as potential energy of the spring.
1/2mu^2 =1/2kx^2
m × u^2 = 5*1000000*9*10^-4
1000 ×u^2 =45*100
u^2 = 4.5
So initial velocity of car is 2.12 m/s.
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