Simple machines make work easier by changing which two factors?

Simple machines make work easier by exchanging

for example , If you need to lift a object in the back of pickup truck, a ramp can be employed to make work easier. rolling the object up the ramp requires  much less force.

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.