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solong [7]
3 years ago
5

A 0.3-kg ball has the velocity of 20 m/s. what is the kinetic energy of the ball?

Physics
1 answer:
snow_tiger [21]3 years ago
7 0

Answer:

60 J

Explanation:

KE = ½ mv²

KE = ½ (0.3 kg) (20 m/s)²

KE = 60 J

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A spring with a spring constant of 350 N/m pulls a door closed. How much work is done as the spring pulls the door at a constant
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The work done to stretch the spring will be 112 J.

<h3>What is spring force?</h3>

The force required to extend or compress a spring by some distance scales linearly with respect to that distance is known as the spring force. Its formula is

F = kx

The given data in the problem is;

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The work is done to stretch the spring is;

\rm W= \frac{1}{2} kx^2 \\\\ W=\frac{1}{2} \times 350 \times (0.850-0.050)^2 \\\\ W=0.5 \times 350 \times (0.80)^2 \\\\W=112 \ J

To learn more about the spring force refer to the link;

brainly.com/question/4291098

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