Solve the all parts of given question:
Question: A swimmer bounces straight up from a diving board and falls feet first into a pool. She starts with a velocity of 4.00 m/s, and her takeoff point is 1.50 m above the pool.
Part I: How long are her feet in the air?
s
Part B: What is her highest point above the board?
m
Part C: What is her velocity when her feet hit the water?
Don't just give me the answer, explain your steps as well.