# physices

an object is falling freely from rest of height of 65m above the ground what is the height of the object from the ground in meter when it reaches velocity of 20m/s?

1. 👍 0
2. 👎 0
3. 👁 49
1. v = 9.8t, so it takes 20/9.8 = 2.04 seconds to achieve that speed.

Since h = 65-4.9t^2,
plug in 2.04 to get h at that time.

1. 👍 0
2. 👎 0
posted by Steve

## Similar Questions

1. ### physics

A certain freely falling object requires 1.25 s to travel the last 35.5 m before it hits the ground. From what height above the ground did it fall?

asked by Claudia on September 16, 2010
2. ### Physics

It takes a freely falling object 1.80 s to travel the last 32.00 m before it hits the ground. From how high of the ground did it fall? Assume it starts from rest.

asked by GraceW1 on September 8, 2015
3. ### physical

Q: a freely falling object requires 1.50s to travel the last 30.0m before it hits the ground . From what height above the ground did it fall ?? Pleazzzz help ....

asked by MSM on September 20, 2008
4. ### Physics

A certain freely falling object requires 1.50 seconds to travel the las 30.0 meters before it hits th ground. From what height above the ground did it fall?

asked by Jen on September 22, 2012
5. ### Physics

A certain freely falling object, released from rest, requires 1.40 s to travel the last 20.5 m before it hits the ground. (a) Find the velocity of the object when it is 20.5 m above the ground. (Indicate the direction with the

asked by Doug on September 3, 2018
6. ### physics

Is the mass of an object has an effect velocity with it land on the ground when freely falling from rest?

asked by Agnes on July 21, 2011
7. ### physics

An object is dropped from a height H above the ground. This free-falling object requires 0.904 s to travel the last 34 m before hitting the ground. From what height H above the ground did the object fall? The acceleration of

asked by maura on September 14, 2012
8. ### physics

An object is dropped from a height H above the ground. This free-falling object requires 0.904 s to travel the last 34 m before hitting the ground. From what height H above the ground did the object fall? The acceleration of

asked by maura on September 14, 2012
9. ### Physics

a) Newton's law of motion states that the acceleration acting on a falling body (assuming no other forces) is  x" = -g, where x(t) is the height of the object above the ground, t is time, and g is the gravitational constant. Find

asked by Jane on October 18, 2009
10. ### Physics

a) Newton's law of motion states that the acceleration acting on a falling body (assuming no other forces) is  x" = -g, where x(t) is the height of the object above the ground, t is time, and g is the gravitational constant. Find

asked by Jane on October 19, 2009

More Similar Questions