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If you throw a baseball straight up, what is its velocity at the highest point?

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

The man of mass m1 and the woman of mass m2 are standing on opposite ends of the platform of mass m0 which moves with negligible friction and is initially at rest with s = 0. the man and woman begin to approach each other. derive an expression for the displacement s of the platform when the two meet in terms of the displacement x1 of the man relative to the platform.

How is the ideal mechanical advantage of a wheel and axle calculated?