A boy with mass 25kg slides down the helical slide at a constant speed such that r=1.5m, θ=(0.4·t)rad, and z= (-1.2·t)m, where t is in seconds. Determine the components of force Fr, Fθ, and Fzwhich the slide exerts onhim at the instant t = 1s

Which body is in equilibrium? (1) a satellite orbiting earth in a circular orbit (2) a ball falling freely toward the surface of earth (3) a car moving with a constant speed along a straight, level road (4) a projectile at the highest point in its trajectory