5. A ballistic pendulum is set up using a block of mass 2.25kg suspended from a string 30cm long. A 10g bullet is fired at the block, the bullet striking the block at a speed of 310m/s. Find the angle of deflection of the block. (48") 6. A hockey puck of mass 440g moving 8.0m/s along the ice is met by a hockey stick which hits the puck with a force of 70N in the opposite direction. The stick is in contact with the puck for 0.30 seconds. Find the velocity of the puck after being struck by the stick. {40m/s [forward]} 7. A car of mass 370kg strikes a mailbox, sending the 50kg box flying at a speed of 13m/s in a direction 250 from the original direction of the car. The car is deflected an unknown amount by the collision, slowing to 20m/s. What was the original speed of the car? {22m/s} 8. Holding rubber exercise balls, a 50kg boy and his 40kg little sister run toward each other and collide. The boy runs at 8m/s while his sister is running at 10m/s. If the collision is perfectly elastic, determine the velocities of the two siblings after the collision. {Vg = 10m/s Vb = -8m/s} 9. A blue curling rock moves forward along the ice at 2.2m/s when it strikes a stationary red curling rock of the same mass. The red rock bounces off at an angle of 770 to the right (CW) and the blue curling rock glances at an angle of 250 to the left (CCW). Find the speeds of the two rocks after the collision. {Vr = 0.95m/s Vb = 2.2m/s}