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A 242 × 10^(4)kg freight car moving alon...

A `242 × 10^(4)kg` freight car moving along a horizontal rail road spur track at 7.2 km/hour strikes a bumper whose coil springs experiences a maximum compression of 30 cm in stopping the car. The elastic potential energy of the springs at the instant when they are compressed 15 cm is

A

`12.1 × 10^(4)` joules

B

`121xx10^(4)` joules

C

`1.21xx10^(4)` joules

D

`1.21xx10^(6)` joules

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The correct Answer is:
B, D
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MOTION-WORK, POWER & ENERGY -Exercise - 2
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  4. A spring is held compressed so that its stored energy is 2.4 J. Its en...

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  5. The system is released from rest with both the springs in unstretched ...

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