A cart launches a ball 15cm high. The vertical distance from the lowest ball to the highest is about two cart heights or 30cm. Estimate the launch speed of the ball? Estimate the time interval between successive stroboscopic exposures? I honestly have no idea where to begin with either problem even after thoroughly reading the chapter where it is supposedly covered. Does the equation y=h-(1/2)(g)(x/v0)^2 have anything to do with the problem?