A67.5-kg basketball player jumps vertically and leaves the floor with a velocity of 1.99 m/s upward.

(a) what impulse does the player experience? magnitude 134.33

(b) what force does the floor exert on the player before the jump?

(c) what is the total average force exerted by the floor on the player if the player is in contact with the floor for 0.450 s during the jump?

Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants