Hey! can someone please help me solve these 2 questions.. i m stuck.. thanks a lot in advance?

1) a 50 g rock is thrown with a velocity of 15 m/s [50 deg from the horizontal] fro the top of a 10 m tower. a) calc. the speed when the rock is at the max. height. b) calc. the max. height. c) calc the velocity when the rock reaches the ground. 2) a 3 kg ball is dropped from the eight of 0.80 m above the top of a... show more 1) a 50 g rock is thrown with a velocity of 15 m/s [50 deg from the horizontal] fro the top of a 10 m tower.
a) calc. the speed when the rock is at the max. height.
b) calc. the max. height.
c) calc the velocity when the rock reaches the ground.

2) a 3 kg ball is dropped from the eight of 0.80 m above the top of a vertical spring of force constant 1200 N/m. what is the max compression of the spring?
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