How do u find the height of an object thrown straight up

[dcgirl16]

how do u find the height of an object thrown straight up if u are only given that it is thrown with a velocity of 30m/s

 

[arildno]

Energy conservation..

 

[dcgirl16]

so how do i do it

 

[arildno]

Write down the equation for energy conservation, perhaps?

 

[blimkie]

how exactly is the question worded?

 

[daniel_i_l]

What is the initial kinetic energy? If that energy is turned to potential energy, how high is the object?

 

[ThomasW]

because energy is conserved, all the kinetic energy will be converted to potential energy
KE = PE
1/2 mv^2 = mgh
1/2 v^2 = gh
1/2 (30)^2 = 9.8 h

 

[arildno]

ThomasW:
Let the original poster try to solve the problem on her own before providing a full solution.

Welcome to PF, by the way.

 

[ThomasW]

alrite, arildno
i'll do that from now on

 

[benzun_1999]

u can also use equations of motion
ie is v^2=u^2+2gs
where v is final velocity here it is 0,
where u is initial velocity(given)
where g is acceleration due to gravity
where s is the distance or height reached.