Launching marble upwards - Find speed (1 Viewer)

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I cannot work out how to get this question answered.

A student launches a marble vertically upwards so that it reaches a maximum height of 40m above it's release height. Calculate:

a).The speed of the marble when it is launched.
b). The speed of the marble at the halfway point.:confused:


Homework Helper
Try with conservation of energy. What sort of energy does the marble have the instant it is launched? How about the instant it reaches its maximum height?
Ok, thanks for your help.:smile:

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