Question

A 50 kg projectile is fired at an angle of 30 degrees above the horizontal with an initial speed of 1.2 X 10^2 m/s from the top of a cliff 142 m above level ground, where the ground is taken to be y=0. a) what is the initial total mechanical energy of the projectile? b) suppose the projectile is traveling 85 m/s at its max height of y=427 m. How much work has been done on the projectile by air friction? C) what is the speed of the projectile immediately before it hits the ground if air friction does one and a half times as much work on the projectile when it is go down as when go up?

Answer 1

For this problem, I have to format it in a wierd way. First I have to identify what type of problem this is. ???

Answer 2

btw the cliff says 142 m above ground

Answer 3

Can anyone please help????

Answer 4

draw a diagram

Answer 5

Make sure you record all information given and choose coordinate system.

Answer 6

start here