A tired physics student drags their backpack along the ground behind them. They exert a force of 20 N at an angle of 55 degrees above the
horizontal. The backpack has a mass of 5 kg and is moving at a constant velocity.

What is the coefficient of sliding friction between the backpack
and the ground?

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?

Discuss how the hardness or softness of the landing surface is related to the time required to stop the egg

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot