2006-09-21 11:15:00 · 10 answers · asked by S--slick 4 in Science & Mathematics ➔ Physics
YES. Since the air is the same for both motions and the rock returns to the ground it was shot from, the striking speed and the shooting speed are equal.
Mathematically: leaving out other resistances,
0.5*m*Vo^2=m*g*h at maximum height,
and m*g*h=0.5*m*Vf^2 at striking the ground
If we rearrange these equations, we will find that Vo=Vf, where Vo and Vf are shooting velocity and striking velocity, respectively.
2006-09-21 21:54:05 · answer #1 · answered by mekaban 3 · 0⤊ 0⤋
no. the 200 mph is from the energy of the slingshot. the return fall is from the energy of gravity. the two are prob not equal so the rock will fall slower.
2006-09-21 18:18:18 · answer #2 · answered by hondacobra 2 · 0⤊ 0⤋
it is possible depending upon the initial height the rock is being shot up and its initial velocity since these two will determine the peak heigth the rock reaches. it is true that the drag force is acting against the velocity but , the gravity is acting to speed up the falling object, so if it has room to travel long enough it can gain that much speed, so it really depends up the peak height it reaches.
2006-09-21 20:29:05 · answer #3 · answered by caesarib 1 · 0⤊ 0⤋
No, not necessarily. Use the formula x=(v)t+1/2at^2+(x)
Which reads:
Displacement equals the initial velocity times the time required to perform the action plus one-half the rate of acceleration times time squared plus the initial position.
Essentially what you need to know is that the force of gravity is 9.8m/s^2. In the case you provided, it would be -9.8m/s^2
2006-09-21 19:10:10 · answer #4 · answered by tmw1689 2 · 0⤊ 0⤋
No it will not. This is because of air resistance; air resistance will not allow the rock to reach a height giving it the potential energy equal to the kinetic energy it started out with.
2006-09-21 19:07:29 · answer #5 · answered by bruinfan 7 · 0⤊ 0⤋
going up 200 m.p.h. !! coming down 98 to 106.7 Mph, depends on the shape of the rock the causes drag!
2006-09-21 18:25:47 · answer #6 · answered by mike s 1 · 0⤊ 0⤋
no ,because eventually the rock will stop going up so it will reach a speed of 0 miles an hr then gravity will take over and i think it will only be able to reach 120 miles an hr coming down
2006-09-21 18:22:56 · answer #7 · answered by tazmatic1 4 · 0⤊ 0⤋
Yes.
Going up the gravity is applying the same magnitude of negative gravity to slow the rock down until the rock stopped.
Coming down the gravity is applying the same magnitude of positive gravity to speed it up.
2006-09-21 18:24:29 · answer #8 · answered by JQT 6 · 0⤊ 0⤋
it can only reach terminal velocity, which depends on it's geometry and weight...two unknowns to find TV.. but the answer is a definite NO
2006-09-21 19:04:51 · answer #9 · answered by Anonymous · 0⤊ 0⤋
F = ma
2006-09-21 19:02:01 · answer #10 · answered by JennyAnn 4 · 0⤊ 0⤋