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  1. E

    Help with Kinetic Energy concept of two masses that move the same distance

    Don't forget that the KE depends on the speed of the blocks, not just the masses and certainly not (at least not explicitly) the distance they move. Hint: consider instead the amount of work done by the force on the masses.
  2. E

    A slice causes a tennisball to spin and deviate from its normal parabolic path.

    This is actually a fluid dynamics problem. The balls spins - thus, as it moves through the surrounding air the flow of air will move faster around one side of the ball and slower on the other. By Bernoulli's principle a faster flow means a lower pressure. Thus we end up with a reduced air...
  3. E

    Solve it using energy conservation?

    Since you know the initial velocity, why not try to solve it using energy conservation?