A rock is thrown directly up with an initial velocity of at instant as shown in the figure below. As it moves up it will reach a certain height at  an instant . It come back to the same height during it's fall from the maximum height at instant . Determine the time it takes for the rock to go from to . Express your answer using one decimal place in units of seconds and take .

Consider the two vectors shown below. The two vectors have magnitudes of

Please express your answer using zero decimal places.

A stone is dropped off a cliff. After this stone has traveled a distance d, a second stone is dropped. Until one of them hits the ground, the distance between the two stones will always: