Calculate the acceleration if you push with a 20-n horizontal force against a 2-kg block on a horizontal friction- free air table

Ahot-air balloonist, rising vertically with a constant speed of 5.00 m/s releases a sandbag at the instant the balloon is 40.0 m above the ground. after it is released, the sandbag encounters no appreciable air drag. compute the velocity of the sandbag at 0.250 s after its release.

The current in a hair dryer measures 11 amps. the resistance of the hair dryer is 12 ohms. what is the voltage?unit:

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?