i need help with this

timer Asked: Apr 25th, 2015

Question description

    1) You toss a frisbee to your friend. It flies in a more-or-less straight line at a constant speed, reaching your friend after about 4 seconds. You estimate that when you released the frisbee, it was spinning around at a rate of about 4 rev/s (revolutions per second). You guess that the air drag slows the rate at which the frisbee spins by about 0.5 rev/s^2. You'd like to figure out how many revolutions the frisbee makes by the time your friend catches it. [NOTE: CAPA does not have units for revolutions, so this is just a dimensionless quantity---just a number].
    the answer for this question is 12 
    but i need answer for question 2 and 3 that are related to this problem
    2)Your friend is about 10 meters away when he catches the frisbee. Estimating that the frisbee is basically a spinning disc whose total mass is about 160 grams, how much energy is transferred to your friend on catching the frisbee? The frisbee's radius is about 15 cm.

    3)What's the magnitude of the average torque (relative to the center of the frisbee) that your friend exerts on the frisbee if he brings it to rest within 125 milliseconds?

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