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Sagot :
Answer:
Explanation:
At the top of 520 m high mountain , the train will lose potential energy due to loss of height from 990 m to 520 m and gain kinetic energy .
Loss of height = 990 - 520 = 470 m
Loss of potential energy = m x g x 470 where m is mass of the train .
Gain of kinetic energy = 1/2 m v² where v is velocity of train at the top of 550 m high mountain .
1/2 m v² = m x g x 470
v² = 2 x 9.8 x 470
v = 95.98 m /s
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