In billiards, if no torque is supplied, when the moving cue ball strikes a stationary ball the two balls often move off at right angles after the collision. The best explanation for this is that

A) the collision is elastic and kinetic energy must be conserved.
B) the collision is inelastic and kinetic energy must be conserved.
C) the collision is elastic and potential energy must be conserved.
D) the collision is inelastic and potential energy must be conserved.

How does the kinetic energy of a charge change as the charge moves under the effect of an electric field from higher potential to lower potential? a. the kinetic energy increases. b.the kinetic energy decreases. c.the kinetic energy remains the same. d.the kinetic energy is always zero.

Suppose you increase your walking speed from 7 m/s to 13 m/s in a period of 2 s. what is your acceleration?

Aboat radioed a distress call to a coast guard station. at the time of the call, a vector a from the station to the boat had a magnitude of 45.0 km and was directed 15.0° east of north. a vector from the station to the point where the boat was later found is = 30.0 km, 15.0° north of east. what are the components of the vector from the point where the distress call was made to point where the boat was found? in other words, what are the components of vector c = b - a?