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## sarah_hendrix7 2 years ago Please help??

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1. sarah_hendrix7

2. shubhamsrg

How comfortable are you with eqns of motion ?

3. Outkast3r09

Did you figure out your question?

4. AravindG

please post this in physics group

5. Outkast3r09

what is the problem? A lot of problems assigned to mathematics classes are actually simple physics problem

6. PhoenixFire

@sarah_hendrix7 Do you still need help?

7. sarah_hendrix7

@PheonixFire If you're willing, I'd love some help.

8. binarymimic

what do you know about an object in freefall? what equation governs its trajectory? in this case it's a single dimensional trajectory. think of the acceleration due to gravity.

9. PhoenixFire

Use the equation $x_f=x_o+v_ot+{1 \over 2}at^2$ Xf is final position Xo initial position Vo initial velocity a acceleration (in this case just gravity) t time For your problem you can set Xo=0, Vo=0. plug in the rest and you'll know how far the object has fallen after time of 1.1 sec. I know this equation is not really needed because the values get set to 0 so here's the shorter version people tend to remember more: $h={1 \over 2}at^2$Now you know for reference where this equation is from.

10. PhoenixFire

For question (b) take the first equation I gave you and rearrange for Vo. plug in the values and you should get the answer.

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