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Serhud [2]
3 years ago
7

Suppose a ball has a potential energy of 5 J when you drop it. What would be its kinetic energy just as it hit the ground? (Igno

re the effect of air resistance.)
Physics
1 answer:
mihalych1998 [28]3 years ago
8 0

If you simply drop it ... so that it's not moving until you let it go ... then
the kinetic energy it has when it hits the ground is exactly the potential
energy it had while you were holding it.

5 J potential energy in your hand  ===>  5 J kinetic energy when it lands


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A county commissioner wants to reduce the amount of waste sent to the local landfill. Which of the following would result in the
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a 77 N net force is applied to a box which slides horizontally across a floor for 6.7 m. What amount of work is done on the box
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7 0
2 years ago
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Answer:

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3 years ago
A student gives a 5.0 kg box a brief push causing the box to move with an initial speed of 8.0 m/s along a rough surface. The bo
WITCHER [35]

Answer:

The time taken to stop the box equals 1.33 seconds.

Explanation:

Since frictional force always acts opposite to the motion of the box we can find the acceleration that the force produces using newton's second law of motion as shown below:

F=mass\times acceleration\\\\\therefore acceleration=\frac{Force}{mass}

Given mass of box = 5.0 kg

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acceleration=\frac{30}{5}=6m/s^{2}

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The box will stop when it's final velocity becomes zero

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Here acceleration is taken as negative since it opposes the motion of the box since frictional force always opposes motion.

5 0
3 years ago
A running back with a mass of 70 kg travels down the field with a velocity of 5.0 m s . Calculate the kinetic energy of the foot
jarptica [38.1K]

K.E = 1/2 mv²

    =  1/2 (70kg) (5.0ms)²

    =  1 ˣ ( 1750) / 2

    = 875 kgms²

     

3 0
3 years ago
Read 2 more answers
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