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Space Problems

Post  Admin on Thu Aug 11, 2011 5:09 am

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

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Acceleration question

Post  roy_534 on Thu Aug 11, 2011 11:38 am

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?

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Acceleration question

Post  roy_534 on Thu Aug 11, 2011 11:42 am

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

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Acceleration Question

Post  mockingbird2 on Thu Aug 11, 2011 11:47 am

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!

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