2 years ago

A car with mass 450 kg has a kinetic energy of 16,256 j. What is the speed of the car?

Physics

1 answer:

Vikentia [17]2 years ago

7 0

Do you still need the answer ?

124058279

2 years ago

yes

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A 40-kg rock is dropped from an elevation of 10 m. What is the velocity of the rock when it is 5-m from the ground?

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Explanation:

Given

mass of rock $m=40\ kg$

Elevation of Rock $h=10\ m$

Distance traveled by rock with time

$h=ut+\frac{1}{2}at^2$

where, u=initial velocity

t=time

a=acceleration

here initial velocity is zero

when rock is 5 m from ground then it has traveled a distance of 5 m from top because total height is 10 m

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$t^2=\frac{10}{9.8}$

$t=1.004\approx 1\ s$

velocity at this time

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$v=0+9.8\times 1.004$

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