Momentum-Impulse Physics 513

Multi-Dimensional Impulse A soccer ball has a mass of 0.40 kg. Initially it is moving to the left at 20 m/s, but then it is kicked. After the kick it is moving at 45° upward and to the right with speed 30 m/s. Find the impulse of the net force and the average net force, assuming a collision time Δt = s

Conservation of Momentum Physics 513

On Your Mark… A marksman holds a rifle of mass m R = 3.00 kg loosely, so it can recoil freely. He fires a bullet of mass m B = 5.00 g horizontally with a velocity relative to the ground of v B = 300 m/s. What is the recoil velocity v R of the rifle?

Bang! A ballistic pendulum comprises a simple system for measuring the speed of a bullet. A bullet of mass m B makes a completely inelastic collision with a block of wood of mass m W, which is suspended like a pendulum. After the impact, the block swings up to a maximum height y. In terms of y, m B, and m W, what is the initial speed v o of the bullet?