Posted by **Herosugar** on Monday, October 8, 2012 at 10:42pm.

Okay so the acceleration g on this planet X is 15 m/s^2

I have solved for all answers but this one.

How long would it take the object to reach a height of 14.1 ? For an object thrown upward there are two times it would be at any hieght. Give the going up answer, a comma, and give the going down answer.

How do we go about this?

- College Physics -
**Samuel**, Friday, October 12, 2012 at 5:56am
Assuming that accelerations is constant,

Given: a=15 ms^-2, s=14.1 m

Applying kinematics equation,

v^2 = u^2 + 2as

Find for u since v is 0,

u= sqrt(2 x -15 x -14.1)

= 20.78

Solve for t,

s= ut + 0.5at^2

14.1= 20.78t + 0.5(15)t^2

//Solve quadratic eqn for t

t= 0.564(Ans), -3.33(not possible)

- College Physics -
**Anonymous**, Wednesday, December 18, 2013 at 5:41am
Solving for t,

14.1=20.78t-.5(15)t^2

subtract using a -15m/s^2 (downward acceleration due to gravity)

## Answer This Question

## Related Questions

- physics - acceleration due to gravity questions when an object is dropped from a...
- Math - The acceleration of an object g = -9.8 m/s^2. From the top of a building ...
- algebra - We can determine the time it would take an object to fall (if there ...
- physics - An object is being thrown upward at 50m How long does it take the ...
- college algebra - The height of an object thrown upward with an initial velocity...
- Physics - An object is thrown upwards from a height of 50.0m at an initial speed...
- calculus 2 - An object thrown in the air on a planet in a distant galaxy is at ...
- Math - An object is dropped from a balloon from a height of 500m. (a) How long ...
- algebra 2 - An object is launched at 19.6 meters per second from a 58.8 meter ...
- Math - Please help!! We can determine the time it would take an object to fall (...

More Related Questions