2007-04-05 06:46:30 · 8 answers · asked by Justin M 1 in Science & Mathematics ➔ Physics
Your acceleration is always 9.81 m/s^2 in the downward direction, however, since you had an initial velocity upwards, you are constantly slowing down. The velocity at the highest point is 0.
2007-04-05 07:01:25 · answer #1 · answered by poseidenneptune 5 · 1⤊ 0⤋
People tempted to answer 0 are wrong and do not understand much of this notion of acceleration!!
Acceleration occurs anytime an object's speed increases, speed decreases, or direction of motion changes which is our case here!
If the acceleration was 0 as the speed is also 0 ... then you'de be stuck in the air floating ...
The right answer is obviously as mentioned above: g.
If it's not that obvious , then go back to the Newton's law of motion:
F1 + F2 + F3 + ... = d(mv)/dt
Once you have jumped, the only force upon you is your weight P=-mg (if you neglet the interaction of the air) and your mass is constant so:
P = m dv/dt = m a
Therefore -mg = ma so a = - g
If v° is your initial velocity when living the ground, then you also have
-mg = m dv/dt so dv/dt=-g
Therefore if you integrate this equation it gives you
v= -g*t + B
As at t=0, v=v° then B=v°
So v = -g*t +v°
From this equation, you can also learn that your velocity will reach 0 at
t=v°/g
Hope this will help you
2007-04-05 07:15:12 · answer #2 · answered by Sarkasme 2 · 0⤊ 0⤋
It is g, the value of gravity.
9.8 meters per second per second
EDIT: the people answering zero are idiots. Your speed is zero at the apex, but acceleration is still g.
If it wasn't, you'd never fall, you morons. You'd just stay up there.
When you jump your acceleration is always g the second your feet stop touching the ground.
2007-04-05 06:53:49 · answer #3 · answered by Anonymous · 5⤊ 1⤋
0m/s. At your optimal element, you're no longer accelerating or decelerating. it incredibly is barely for Nano-seconds however. you will then start to strengthen up at -9.8m/s because of the fact it incredibly is the pull of gravity on you. (Assuming that air resistance is negligible)
2016-11-07 07:19:00 · answer #4 · answered by ? 4 · 0⤊ 0⤋
Your acceleration is not exactly 9.8 since you are not in a vacuum. But zero would be your speed since you are not moving.
And since you are not moving in the air, only force on you is gravity which pulls you at 9.81 m/s^2 IN A VACUUM.
2007-04-05 06:57:39 · answer #5 · answered by Anonymous · 0⤊ 2⤋
9.8 m/sec^2 ... Gravity
2007-04-05 06:56:16 · answer #6 · answered by Gene 7 · 2⤊ 0⤋
zero
2007-04-05 06:52:20 · answer #7 · answered by Joe the Engineer 3 · 0⤊ 5⤋
Zero...You are stopped...
2007-04-05 06:53:45 · answer #8 · answered by Anonymous · 0⤊ 5⤋