a flea in flight

problem 1) In this problem, you will apply kinematic equations to a jumping flea. Take the magnitude of free-fall acceleration to be 9.80m/s^2 . Ignore airresistance.

1. A flea jumps straight up to a maximum height of 0.510m . What is its initial velocity as it leaves the ground?

2. How long is the flea in the air from the time it jumps to the time it hits the ground?
time in air=____s

i just need question #2

Problem 2) A rock is thrown vertically upward with a speed of 19.0 {rm m/s} from the roof of a building that is 50.0 {rm m} above the ground. Assume free fall.1. In how many seconds after being thrown does the rock strike the ground?t=___s2. What is the speed of the rock just before it strikes the ground?Vground=_____m/si dont get this problem...
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