A boy throws a stone vertically in the air with an initial speed of 40 m/sec. at the instant the stone is thrown, a monkey at the top of a tree h m high falls freely. How long will it take for the stone to hit the monkey if they meet at a point mid way between the ground and the top of tree?

1 sec

Explanation:

Using 1st equation of motion you can get the value of time and this will be 2.0 secs for height "h" but we wanna find for "h/2" just divide your time by 2 also. You will get your answer.

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.