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Help please I can't do these !!!!

You throw a rock off the top of a building located on the Planet Mars with an initial velocity of 10.0 m/s. The force of gravity on Mars is ⅓ that of Earth. It takes 12.0 s to hit the ground. How tall is the building?


You shot a gun straight up into the air with a velocity of 500 m/s. How long will it take before it hits the ground again?


You shoot a gun with a initial velocity of 500 m/s horizontally at the exact instant you drop a rock from exactly the same height (at 1.6 m off of the ground). Which one will hit the ground first.

Respuesta :

Menna3aly
1) G.mars= 9.8x(1/3)=3.26
Vi=10 m/s , T=12 sec
Dis. = Vi(t)+1/2(g)(t)^2
(10)(12)+1/2(3.26)(12)^2= 354.72
2)V=500 m/s
Hmax= v^/2(g) = 500^2/2(9.8) = 12755.1

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