v2 - u2 = 2as
so that a = (v2 - u2)/2s
where
u = initial velocity
v = final velocity
s = distance
a = acceleration
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Assuming constant acceleration: distance = v(0) t + (1/2) a t squared Where v(0) is the initial 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.
Without distance, you have to know time, initial velocity, and acceleration, in order to find final velocity.
You can't. Acceleration is change in velocity. If given a constant velocity, the acceleration is zero.
You use the information you're given, along with the equations and formulas you know that relate distance, time, speed, and acceleration, to calculate the number you're asked to find. And here's a tip: Chances are that the initial acceleration, the final acceleration, and the acceleration all along the way, are all the same number.