Which statements about density is true?

Iwill give brainliest if you answer right : )

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest

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