A blue bowling ball rolled with a force of 15 N accelerates at a rate of 3m/sec2 a second red ball rolled with t he same force accelerates at 4m/sec2 what are the masses of two balls.

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?

If element x has 99 protons how many electrons does it have

Suppose a soccer ball is kicked from the ground at an angle 20.0º above the horizontal at 8.00 m/s. the y-velocity is determined to be 2.74 m/s. how long will the ball be in the air? assume the ball lands at the same height at which it was kicked.