Một vật được thả rơi từ độ cao 20m xuống đất. Lấy g = 10m/s^2. a/ Sao bao lâu vật rơi chạm đất?
b/ Tìm độ lớn vận tốc lúc vật vừa chạm mặt đất?
c/ Tìm quãng đường vật rơi được sau 1 giây kể từ lúc thả?

The slope of a velocity time graph over any interval of time gives the during that interval

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?

What describes the particles in a liquid