Một vật nặng rơi từ độ cao 20m xuống đất. Tính thời gian rơi và vận tốc của vật khi chạm đất. Lấy g = 10 m/s²

What color of light must blue light mix with to create white light? a. yellow b. white c. blue d. green

Matt is driving down 7th street. he drives 150 meters in 18 sec. assuming he doesn’t slow down or speed up, what is his speed?

Ametal ball with a mass of 0.028 kg is dropped from rest at a height of 1.0 meters above the ground. assuming the energy in the ball is conserved, how much kinetic energy will the ball have when it is 0.5 meters above the ground?