physicssss

2. A rock is dropped from a bridge that is 28 meters above a river. How long does it take the rock to hit the water? (Answer: t=2.36 sec) 3. A lacrosse ball that is thrown straight upwards reaches a maximum height of 4.5 meters. At what speed was it thrown? (Answer: v=9.48 m/s) 4. A soccer player heads the ball and sends it flying vertically upwards at a speed of 12.0 m/s. How high above the players' head does the ball travel? (Answer: d=7.2m) 5. A snow ball is thrown upward at a speed of 27 m/s. How high (above the position from which it was thrown) is the snow ball 3.5 seconds later? Also, how fast is it moving at that time? In what direction? (Answer: d=33.25 m, v=-8mls,i.e. snowball is moving downwards) 6. A mis-hit golf ball flies straight up in the air. Exactly 4.0 seconds later it lands right next to the tee. How high up did the golf ball go? (Answer: d=20 m)