Arock is thrown upward from the level ground in such a way that the maximum height of its flight is equal to its horizontal range r.
(a) at what angle θ is the rock thrown? °
(b) in terms of its original range r, what is the range rmax the rock can attain if it is launched at the same speed but at the optimal angle for maximum range? rmax =
(c) would your answer to part (a) be different if the rock is thrown with the same speed on a different planet? yes no

Answer

a) For the rock

b) for maximum range

c) The value of θ is the same on every planet as g divides out.

the answer is 3.1 his answer is wrong mines is right

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )