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hello!

have you got any ideas?

Not at all, i got some some earlier but theres a few that I'm lost on.

and, as you know, the laws of Physics are the same into all inertial systems

so none of them are greater than the other? correct?

yes! correct, since the velocity of the system truck+boat, is constant in all of your three cases

how could i try and explain that in a few sentences?

what about the first question?

now, I solve the second equation for t, and I get:
\[t = \frac{d}{v}\]

i dont understand you math I'm confused

the subsequent drawing represents the situation of your exercise:
|dw:1432832271358:dw|

so, what is v?

i dont understand the equation like how its written so i dont know

do you know the law of falling bodies?

no

would the answer be 3.03 seconds ?

please wait a moment

okay :)

the answer to the first question is:
\[v = \sqrt {\frac{{9.81}}{{2 \times 45}}} \times 15\]

45=4.9t^2
9.184=t^2
t=3.03sec
That is what i got for the first

yes I know, nevertheless, you have to compute the velocity v, since your problem asks for a velocity

so it that right?
and the 2nd one i got true, true, false, true, false?

we have:
\[v = \sqrt {\frac{{9.81}}{{2 \times 45}}} \times 15 = 4.95\;m/\sec \]

I'm pondering....

the requested equation is:
\[v = \sqrt {\frac{g}{{2 \times h}}} \times d = 4.95\;m/\sec \]

|dw:1432834613891:dw|

ohhhhhh okay i think i get it, what about the second?

please, I'm pondering...

its asking which ones are true and which are false, what are you saying those are?

okay, so what goes where in the equation?

in both formulas M_T is the mass of the earth

now, we have to use this condition:
\[\Large \frac{{{W_1}}}{W} = \frac{1}{{16}}\]

the height?

yes!

|dw:1432838068670:dw|