1.) A tennis ball (mass = 57 grams) is held directly above a basketball (mass = 624 grams)that is held 4.7 meters off the ground. Both are dropped simultaneously. Assuming an
elastic collision, how high above the ground does the tennis ball reach after bouncing? (Note that the tennis ball bounces off the basketball which is 24 cm in diameter.)
2.)
A bullet with mass 0.050 kg is shot
through a block suspended from a cord with length 0.75 m. The block has mass
1 kg and is initially suspended
vertically a distance 1.2 meters off the floor. After the bullet goes through the block, it is observed that the block rises to an angle of 64 degrees and that the bullet lands a horizontal distance of 40.0 meters from the pendulum. What was the initial speed of the bullet?
Pi=Pf
Ki=Kf
1 answer