A) 40 m/s
B) 20 m/s
C) 10 m/s
D) 10V30m/s
Correct Answer: A
Solution :
[a] If all the forces (external) are conservative and there is no external force exerting on the system, then we apply principle of conservation of total mechanical energy of the system. |
According to conservation of energy, |
or |
or |
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