Arock weighing 98 newtons is pushed off the edge of a bridge 50 meters above the ground. what was the potential energy of the rock before it began to fall?

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

Ethanol has a heat of vaporization of 38.56 kj/mol and a normal boiling point of 78.4 c. what is the vapor pressure of ethanol at 14 c?