Friday

August 22, 2014

August 22, 2014

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

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 5:56amAssuming 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 5:41amSolving for t,

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

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

**Related Questions**

physics help 3!! ** - Based on the following data about planet X (which orbits ...

physics - The acceleration due to gravity on planet X is one fifth that on the ...

physics - The acceleration due to gravity on planet X is one fifth that on the ...

Free Fall - The acceleration due to gravity on planet X is one fifth that on the...

earth - The acceleration due to gravity on planet X is one fifth that on the ...

physics - On planet x, an object weighs 10.4N. On planet B where the magnitude ...

Physics - An object is allowed to fall freely near the surface of an unknown ...

College Physics - Weight - A planet has a mass of 7.93 × 1023 kg and a radius of...

physics - acceleration due to gravity questions when an object is dropped from a...

algebra - We can determine the time it would take an object to fall (if there ...