Ball b, with a mass of 30kg, is moving to the left at -10 m/s. with what velocity should ball a, with a mass of 10 kg, move to the right and collide with b, so that ball a rebounds with a velocity of -30 m/s, and ball b with velocity of 10 m/s, after the collision? assume the collision to be perfectly elastic

inelastic formula

Consider a u-tube whose arms are open to the atmosphere. now equal volumes of water and light oil (ρ = 49.3 lbm/ft3) are poured from different arms. a person blows from the oil side of the u-tube until the contact surface of the two fluids moves to the bottom of the u-tube, and therefore, the liquid levels in the two arms are the same. if the fluid height in each arm is 30 in, determine the gage pressure exerted by the person on the oil by blowing.