The friction that brings a boat to a stop after the motor has been cut is
1) sliding friction
2) rolling friction
3) atomic friction
4) fluid friction

Will you chech and finish these for me, because i am stumped with them.

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

Wavelength of 125 meters is moving at a speed of 10 m/s. what is it's frequency?