Answer:
Explanation:
Given
Mass of girl
Mass of Plank
let and be the velocity of Plank and girl w.r.t ice
therefore
Conserving Momentum
As the molecules heat and move faster, they are moving apart. So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward.
acceleration of object ais help the acceleration of an object b OD
Answer:
it can cause internal bleeding
It is anatomically impossible to kill someone by breaking the nose and driving the bone end up into the brain.
Answer:
a) simple machines are devices which makes work easier and simple