You pull a 20 kg wagon at constant speed on a horizontal floor by exerting a 40 N force on the handle, which make an angle with the horizontal. The force of friction on the
wagon is 30 N.
1. What angle does the handle make with the horizontal?
2. What is the normal force on the wagon?
3. What is the coefficient of friction?

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.

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.