A 4kg soccer ball sits on the ground. A boy comes up and kicks the ball 24m. If the work done was 78j, what was the balls velocity. I really need help :/

Aball is thrown straight up into the air with a speed of 21 m/s. if the ball has a mass of 0.1 kg, how high does the ball go? acceleration due to gravity is g = 9.8 m/s^2. a. 22.5 m b. 20.0 m c. 25.0 m d. 17.5 m

Astudent wears sunglasses to her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses? a polarization b.refraction c.diffraction d. interference

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =