Calculate the potential energy of an object with a mass of 15 kg while sitting on a shelf that his 20 m high

2943J

Explanation:

Ep = mgh

given that,

m = 15kg

h= 20m

and

g = 9.81 m/s^2

Ep= 15 × 9.81 × 20

Ep= 2943J

the moon affects the earth gravitation ally, causing certain motions of that body and also producing tides in its ocean and atmosphere. the tidal wave in our atmosphere is, however, far too minute to be an effective cause in any known meteorological phenomenon.

explanation:

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.