# Space Problems

HSC-Physics :: Space

## Space Problems

Have a problem you can't solve or a question you can't answer? Post it here!

**Admin**- Admin
- Posts : 10

Join date : 2011-08-11

## Acceleration question

this is my question:

An astronaut is standing on Mars. The astronaut throws an object of mass 0.30kg vertically upward at an initial speed of 9.0 m/s. It reaches a maximum height of 11m. What is the magnitude of the acceleration?

An astronaut is standing on Mars. The astronaut throws an object of mass 0.30kg vertically upward at an initial speed of 9.0 m/s. It reaches a maximum height of 11m. What is the magnitude of the acceleration?

**roy_534**- Posts : 2

Join date : 2011-08-11

## Acceleration question

also i dont get what the mass has to do with it. do i need to use newton's gravity equation?

**roy_534**- Posts : 2

Join date : 2011-08-11

## Acceleration Question

the mass is irrelevant in this case

you need to use the equation v^2 = u^2 + 2ar

when the ball gets 11m off the surface (r = 11), its vertical velocity is 0 (v = 0).

hence 0 = 9^2 + 2 x a x 11

so you get a = -3.7 (to 2 sig figs cause that is the least amount given in the question)

hope that helped!

you need to use the equation v^2 = u^2 + 2ar

when the ball gets 11m off the surface (r = 11), its vertical velocity is 0 (v = 0).

hence 0 = 9^2 + 2 x a x 11

so you get a = -3.7 (to 2 sig figs cause that is the least amount given in the question)

hope that helped!

**mockingbird2**- Posts : 1

Join date : 2011-08-11

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