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yawa3891 [41]
3 years ago
15

15kg cat initially traveling +2m/s accelerates at +2m/s2 for 5 seconds how much kinetic energy does it again?

Physics
1 answer:
user100 [1]3 years ago
6 0

Answer:

A) 1050[J]

Explanation:

First, we must calculate the initial kinetic energy when the cat moves at 2 [m/s].

E_{1} =0.5*m*v_{o}^{2} \\where:\\m = mass = 15[kg]\\v_{o} = 2[m/s]\\\\therefore\\E_{1} =0.5*15*(2)^{2} \\E_{1}= 30[J]

Then we can calculate the final velocity with the acceleration and time data that was given.

v_{f} = v_{o}+a*t\\ v_{f} =2+(2*5)\\v_{f} = 12[m/s]

And we can calculate the kinetic energy as follows:

E_{2} =0.5*m*v_{f}^{2} \\E_{2} =0.5*15*(12)^{2} \\E_{2} = 1080[J]

And now we can calculate the difference in kinetic energy by simply subtracting the values calculated above.

DE = 1080 - 30 = 1050[J]

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Answer:

Weight of the object will be 98 N

Explanation:

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So weight of the object W = mass × acceleration due to gravity

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1. Describe the three Newton's Law of Motion.
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Answer:

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2nd— The second law explains how the velocity of an object changes when it is subjected to an external force. The law defines a force to be equal to change in momentum(mass times velocity) per change in time. Newton also developed the calculus of mathematics, and the "changes" expressed in the second law are most accurately defined in differential forms. (Calculus can also be used to determine the velocity and location variations experienced by an object subjected to an external force.) For an object with a constant mass m, the second law states that the force F is the product of an object's mass and its acceleration a:

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For an external applied force, the change in velocity depends on the mass of the object. A force will cause a change in velocity; and likewise, a change in velocity will generate a force. The equation works both ways.

3rd law-- The third law states that for every action (force) in nature there is an equal and opposite reaction. In other words, if object A exerts a force on object B, then object B also exerts an equal force on object A. Notice that the forces are exerted on different objects. The third law can be used to explain the generation of lift by a wing and the production of thrust by a jet engine.

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<span>The medium in which it travels through</span>
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marissa [1.9K]

Answer:

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Explanation:

The angular acceleration is the time rate of change of angular velocity. It is given by the formula:

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Also, angular velocity is the time rate of change of displacement. It is given by:

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