Physics ASAP
posted by Jess .
I have a few questions that I need help with and that need to be checked please.
t takes 6 seconds for a stone to fall to the bottom of a mine shaft. How deep is the shaft? (I know I have to use this formual d=vinitial+1/2gt^2, I plug in these numbers d=0+1/2(9.8m/s^2)(6^2 s= 176.4 m, is this right?)
If a projectile is fired straight up at a speed of 10 m/s, the total time to return to its starting position is about (I know I have to use this formula, hfinal=hinitial+vinitial *time+ 1/2gt^2, these are the numbers I plugged in hfinal=0+0*10m/s+1/2(9.8m/s^2(10m/s)^2=490 s, when I suppose to get 2 seconds for my answer.
Ten seconds after starting from rest, an object falling freely downward will have a speed of about ? (I know I have to use this formual vfinal=gt, here is what I plugged in vfinal=(9.8m/s^2)(10 s)=98 m, when I am suppose to get 1000 m/s
A man leans over the edge of a cliff and throws a rock upward at 4.9m/s. How far below the level from which it was thrown is the rock 2 seconds later? ( would the formula I use be d=vt?

yes on the stone falling.
No on the second.
Hfinal=hinitial+ vinitial*t 4.9t^2
0=0+10t4.9t^2 solve for t
The third: vfinal=gt= 9.8m/s^2*10sec=98m/s. It wont be 1000m/s
The final:
Hfinal=Hinitial+Vi*t  4.9t2
Let Hintialal be 0
Respond to this Question
Similar Questions

Physics Probelms ASAP
Could you please check my work and help me with a couple. An airplane that flies at 100 km/h with a 10 km/h tailwind travels at 110 km/h relative to the ground. If it instead flies into a 10 km/h headwind, its groundspeed is : 110 … 
AP Physics
Could you please help me out with the following problems please? 
AP Physics Word Problems ASAP!
Could you please help me out with the following problems please? 
Phyics Word Problems
I have a few questions that I need help with and one that needs to be checked please? 
Physics
Carol drops a stone into a mine shaft 12.6 m deep. How soon after she drops the stone does she hear it hit the bottom of the shaft? 
physics
Carol drops a stone into a mine shaft 122.6 m deep. How soon after she drops the stone does she hear it hit the bottom of the shaft? 
Physics
You are hiking out in California and come across an abandoned mine shaft. Wondering how deep the mine shaft is you toss a rock in and it takes 5.1 seconds before hitting the bottom. How deep is the mine shaft in meters? 
physics
a stone is dropped from rest at the top of a mine shaft. it takes 59 s for a stone to fall to the bottom of a mine shaft. how deep is the shaft? 
physics
A stone is dropped from rest at the top of a mine shaft. It takes 58 s for a stone to fall to the bottom of a mine shaft. How deep is the shaft? 
physics
It takes 5 seconds for a stone to fall to the bottom of a mine shaft. How deep is the shaft?