You can't, because you don't have enough information.
In order to find velocity, you need to be able to find the speed and the direction
of motion. You have the speed, but you have no information that you can use to
determine the direction in which the object is moving. Mass doesn't help.
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momentum = mass x velocity => mass = momentum / 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.
You can't. The mass is irrelevant to velocity. You need the distance.
You cannot. Force = Mass*Acceleration or Mass*Rate of change of Velocity.
You can't. Acceleration is change in velocity. If given a constant velocity, the acceleration is zero.