What force is needed to accelerate a 0.5kg football at a rate of 40m/s

Which is not a source of noise pollution? a)airplanes b)acid rain c)machines d)cars

Describe uniform velocity and variable velocity in short

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n