A 80 kilogram mountain climber scales a 50m cliff. How much work is done by the mountain climber?

What object a collides with object b and bounces back its final momentum is?

Convection currents are caused by differences in what two things?

Two trains leave a station at the same time, train a travels at a constant speed of 16 m/s. train b starts at 8.0 m/s but accelerates constantly at 1.0 m/s squared. after 10.0 seconds, which train has the greater speed?