Use the formula Acceleration = (final velosity - initial velocity)/ time.
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You can't. Acceleration is change in velocity. If given a constant velocity, the acceleration is zero.
You do not need force. Velocity is the integral of acceleration with respect to time. The orthogonal components of acceleration can be integrated independently to give the orthogonal components of velocity.
You cannot. Force = Mass*Acceleration or Mass*Rate of change of Velocity.
Without distance, you have to know time, initial velocity, and acceleration, in order to find final velocity.
Power is equal to Force times velocity; P=Fv. You are given the 'speed', which I assume to be velocity. You also have acceleration. In order to find F, you need first to find the mass, which you can calculate from the weight, Fg, by dividing by the acceleration due to gravity, 9.8. You then have the mass. From here, multiply mass times acceleration times the velocity.