Monday

April 21, 2014

April 21, 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**

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

College Physics - Suppose a planet is discovered that has the same total mass as...

Physics - The free-fall acceleration at the surface of planet 1 is 18 m/s^2. The...

physics - An object rests on the surface of planet y. Its mass is unknown. Find...

physics - Planet Z is 1.00×10^4 km in diameter. The free-fall acceleration on ...

Physics - A 21.0-kg satellite has a circular orbit with a period of 2.37 h and a...

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

college physics - A new planet has been discovered that has a mass one-tenth ...

physics - A planet orbits a star, in a year of length 4.46 x 107 s, in a nearly ...

Physics - Imagine you are an astronaut who has landed on another planet and ...