- #1

- 81

- 0

What would the equation be for this question?

I know that:

Height: 30.0m

Gravity: 9.81m/s

I'm not quite sure what else I need to figure this out? thank! :)

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- Thread starter Brittykitty
- Start date

- #1

- 81

- 0

What would the equation be for this question?

I know that:

Height: 30.0m

Gravity: 9.81m/s

I'm not quite sure what else I need to figure this out? thank! :)

- #2

- 81

- 0

Is this a trick question where its 0m/s?

- #3

Galileo

Science Advisor

Homework Helper

- 1,989

- 6

E = 1/2mv^2+mgh

Alternatively, you could use the equation of motion for the object. You know it has a constant acceleration g downwards.

- #4

- 81

- 0

E=1/2 (230kg)(0.02ms) ^2 + (230kg)(9.81m/s)(32m)

0.092 + 77201.6 = 77201 ?

- #5

- 81

- 0

oops i mean

5.43 + 72201.6 = 72207.03

5.43 + 72201.6 = 72207.03

- #6

Galileo

Science Advisor

Homework Helper

- 1,989

- 6

You haven't been given the mass of the object, but the answer will be independent of the objects mass anyway.

You have two special points in the objects trajectory which are important to your question. Which are those and what is the expression for the energy at those points?

- #7

- 81

- 0

gravity, height and time?

- #8

- 8

- 0

- #9

- 754

- 1

http://www.physicsclassroom.com/class/1dkin/u1l6a.cfm

That should lead you in the right direction

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