Posted by **Derp** on Wednesday, August 22, 2012 at 2:03am.

An object is thrown upwards at an initial speed of 19.6m/s from a height of 55m. How long will it take for the object to reach the ground.(from the time it was thrown)

- Physics -
**drwls**, Wednesday, August 22, 2012 at 3:09am
Solve this equation for t:

H(t) = 55 + 19.6 t -4.9 t^2 = 0

Take the positive root. (There will be two solutions.)

- Physics -
**charlie**, Wednesday, August 22, 2012 at 9:39am
Drwls

Could it also be solved by using

v=u+at for the upward throw;then another motion equation for the upward distance; added to the fall time (sqrt 2h/g) all the way to the bottom?

Charlie

- Physics -
**drwls**, Wednesday, August 22, 2012 at 10:10am
Yes, that would work also.

## Answer this Question

## Related Questions

- Physics - An object is thrown upwards at an initial speed of 19.6 m/s from a ...
- Physics - An object is thrown upwards from a height of 50.0m at an initial speed...
- math - An object is thrown or fired straight upwards at an initial speed of v_0 ...
- math - An object is thrown or fired straight upwards at an initial speed of v_0 ...
- physics - An object is being thrown upward at 50m How long does it take the ...
- Physics - An object is thrown upwards with a speed of 14.0 m/s. How long does it...
- physics - An object is thrown upwards and after 2 seconds is 78 m above where it...
- Physics - A ball is thrown upwards, from a building. It's height(h), in meters ...
- Math - The acceleration of an object g = -9.8 m/s^2. From the top of a building ...
- 11 Physics - my teacher gave me this question for review and i don't know how to...