Aball is thrown straight up from the ground with speed v0. at the same instant, a second ball is dropped from rest from a height h, directly above the point where the first ball was thrown upward. there is no air resistance. a) find the time at which the two balls collide. express your answer in terms of the variables h, v0, and appropriate constants. b) find the value of h in terms of v0 and g so that at the instant when the balls collide, the first ball is at the highest point of its motion. express your answer in terms of the variables v0 and g.

a)

b)

Explanation:

Let the first ball throw be the point of reference, we can have following the equation of motion:

1st ball:

2nd ball:

a)When the 2 balls collide they are at the same spot at the same time:

b) The first ball is at its highest point when v = 0. That is

After this time, the 2 balls would have traveled through a distance of

Since we can solve for H

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer

temp rises, and expansion