Why would the total energy change if there is no friction?
At the top he has potential energy due to height but not much kinetic, only that due to his horizontal velocity which is low.
When he comes down he gains kinetic but loses the same amount of potential.
A pole-vaulter has 3500J of energy when he crosses a bar 7 meters high. How much kinetic energy will he have just before he reaches the ground ( assuming no friction) ?
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