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ludmilkaskok [199]
3 years ago
13

Someone please help me for 7 points.... I don't know how to do this...

Physics
1 answer:
ololo11 [35]3 years ago
6 0

you need G, grav constant, here.

F=GMmoonMEllen/R^2

all other numbers given ... calculate ...

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Answer:

t=7.33 s

Explanation:

According to Newton's second law:

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because we don't want the box to slide, the acceleration has to be zero.

\sum F=-F_{friction}+F_{truck}=0\\F_{truck}=F_{friction}\\F_{friction}=\µ*m*g=0.500*9.81*m\\F_{friction}=4.91*m

we know that:

F=m*a\\4.91m=m*a\\a=4.91m/s^2

Now having the acceleration, we can use the following formula.

v_f=a*t\\t=\frac{36.0m/s}{4.91m/s^2}\\\\t=7.33s

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