college physics

The person in the drawing is standing on crutches. Assume that the force exerted on each crutch by the ground is directed along the crutch, as the force vectors in the drawing indicate. If the coefficient of static friction between a crutch and the ground is 1.21, determine the largest angle θMAX that the crutch can have just before it begins to slip on the floor.

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  1. A steel ball is dropped from a diving platform (with an initial velocity of zero). Use the approximate value of g = 10 m/s2.
    (a) Through what distance does the ball fall in the first 2.0 s of its flight?

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