Please please help me, don't guess please my test is timed !! A tennis player hit a .057-kg ball with a force of 40 N. The duration of the force was .05 s.
1. Calculate the impulse delivered to the ball. (1pt)

2. What was the change in momentum of the ball? (1pt)

3. What was the velocity of the ball as it left the tennis racket? (1pt)

4. What would happen to the ball's velocity if it remained on the tennis racket longer than .05 s? (2pts)

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length (in m) of a column of water 1.45 km high for a temperature increase of 1.12°c. assume the column is not free to expand sideways. as a model of the ocean, that is a reasonable approximation, as only parts of the ocean very close to