Throws a rock 53° up to a 20-meters cliff that is 15 meter away. Find the initial speed which makes the rock land at the edge of the cliff

What is work? how much work is done to move an object 0 meters?

Asystematic approach to problem solving is called a (an)

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?