# Physics

posted by Kirk

1An object is thrown upward at an initial velocity and caught at the same level as it was thrown. What should the maximum height be if the hang time is 6.4?

(please report numerical value to 2 decimal places- unit will not be necessary to report)
2An object is thrown upward at an initial velocity and caught at the same level as it was thrown. What should this velocity be if the hang time is 5.1?

(please report numerical value to 2 decimal places- unit will not be necessary to report)
3A skydiver is initially freefalling but as she approaches the surface of the Earth, she releases her parachute. Which of the following statements will be true about her motion?

a. The skydiver's velocity will slow to a stop when the chute opens
b. The skydiver will begin moving in the upwards direction (away from the Earth)
c. The skydiver will reach terminal velocity when the chute opens
d. The skydiver will continue to freefall until she reaches the Earths surface

1. Damon

at maximum, vertical velocity is zero
time up is half the time in the air
v = Vi - g t
0 = Vi - 9.81 t
Vi = 9.81 t = 9.81(3.2)
Vi = 31.4 m/s
h = 31.4 (3.2) - (1/2)(9.81)(3.2)^2
h = 100.5 - 50.2
h = 50.3

do the second one the same way

I refuse to reply to the third one because I think you can figure it out.

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