Hai vật có khối lượng hơn kém nhau 4 lần, được thả rơi tự do cùng một lúc tại cùng một vị trí. Khi chạm đất thì

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

Aparticle moves in the xy plane with constant acceleration. at time zero, the particle is at x = 6 m, y = 8.5 m, and has velocity ~vo = (9 m/s) ˆı + (−2.5 m/s) ˆ . the acceleration is given by ~a = (4.5 m/s 2 ) ˆı + (3 m/s 2 ) ˆ . what is the x component of velocity after 3.5 s? answer in units of m/s.

Aboy with a mass 25 kg climbs into a small tree. he sits on a branch that is 2.o m above to the ground.what is his gravitational potential energy above the ground?