A car is lifted a 1 m above the floor in a service station and therefore has potential energy relative to the floor. Next is lifted 2 m above the floor. How has the potential energy increase? Explain.

The man of mass m1 and the woman of mass m2 are standing on opposite ends of the platform of mass m0 which moves with negligible friction and is initially at rest with s = 0. the man and woman begin to approach each other. derive an expression for the displacement s of the platform when the two meet in terms of the displacement x1 of the man relative to the platform.

Which of these metals are magnetic?

Amother used 150 watts of power to raise a 15 newton object in a time interval of 8.0 seconds. through what vertical distance was the object raised ?