# physics

posted by .

how do you find time?

• physics -

I assume this is the time to fall a distance to Earth.

h= vi*t-1/2 9.8 t^2 where Vi is the initial upward velocity (in the last post, that is zero).

t= 2(height)/g

## Similar Questions

1. ### Physics

A first order exponential decay can be written as A(t)= Ae^(-t/r) where A(t) is the amount (of substance) after time t, A is the initial amount at time t=0 and r is the decay time. The fall time is defined as the time in which A(t) …
2. ### Physics

A particle initially located at the origin has an acceleration of a= 5.00J^ m/s^2 and an initial velocity of v0= 8.00I^ m/s A) Find the vector position at any time t where t is measured in seconds. Find the vector velocity at any time …
3. ### Physics

A runner’s velocity along a straight track is 3.2 m/s at time 5.0 s and 2.2 m/s at time 13 s. Find the runner’s average acceleration during this time interval.
4. ### Urgent!!! Physics

At an air show, a jet plane has velocity components Vx = 625 and Vy = 415 at time 3.85s and Vx = 838 and Vy = 365 at time 6.52s . A. For this time interval, find the x component of the plane's average acceleration in km/h2. B. For …
5. ### physics

At time t=0 a projectile passes through the point (0,0,192) with a velocity v=10i-2j+16k. Because of spin and gravity, the projectile experiences an acceleration given by a=2i-32k. a. Find the velocity v(t) and position vector R(t) …
6. ### physics

A runner’s velocity along a straight track is 3.2 m/s at time 8.0 s and 2.2 m/s at time 11 s. Find the runner’s average acceleration during this time interval.
7. ### Physics

Suppose the position of an object at time t is (6 + 5t, 2t2, 7t − 5t3). (a) What is the instantaneous velocity at time t?
8. ### Calc Physics

The velocity as a function of time for an asteroid in the asteroid belt is given by v(t)= vo e^(-t/to)i + (vo t/ 2 to) j with vo and to constants. Use ti = 0 as the initial time, and tf = 472 s as the final time. The values for the …
9. ### Physics

A particle travels along the x axis with a constant acceleration of +2.7 m/s2. At a time 4.2s following its start, it is at x = -108 m. At a time 5.7 s later it has a velocity of +13.0 m/s. Find its position at this later time. Please …
10. ### math/physics

A pomegranate is thrown from ground level straight up into the air at time t = 0 with velocity 96 feet per second. Its height at time t seconds is f(t) = −16t2 + 96t. a) Find the time it hits the ground. t=?

More Similar Questions