A 1.50 kg stone is sliding to the right on a frictionless, horizontal surface at 4.00 m/s when it is suddenly struck by an object that exerts a horizontal force on it for a short period of time. The graph below shows this force as a function of time. (For this problem remember to check your units) F (KN) 2.50 t (ms) 15.0 16.0 What impulse does this force exert on the stone? If the force acts to the right, what is the velocity of the stone as soon as the force stops acting on it? If, instead, the force acts to the left, what is the velocity of the stone as soon as the force stops acting on it