1.

A 242 x 104kg freight car moving along ahorizontal rail road spur track at 7.2 km/hourstrikes a bumper whose coil springsexperiences a maximum compression of 30cm in stopping the car. The elastic potentialenergy of the springs at the instant whenthey are compressed 15 cm is210(A) 12.1 x 104 joules (B) 121 x 104 joules(C) 1.21 x 104 joules (D) 1.21 x 106 joules

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