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2 years ago

A mass of 2000 kg is raised 5 m in 10 seconds. What is the kinetic energy of the mass at that height?

Physics

1 answer:

madam [21]2 years ago

3 0

<h3><u>Answer;</u></h3>

98,000 joules

<h3><u>Explanation;</u></h3>

Kinetic is the energy possessed by a body in motion; while kinetic energy is the energy possessed by a body while at rest.

Potential energy is given by; mgh, where m is the mass, g the gravity, 9.8 m/s² and h is the height.

Energy can be transformed from one form to another and can neither be created or destroyed.

Therefore;

Potential energy = 2000 × 5 × 9.8

= 98,000 joules

Therefore, the kinetic energy will still be 98,000 joules, when the body is in motion.

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Evgesh-ka [11]

Answer: (1) The correct answer is A.

(2) The correct answer is D.

Explanation:

(1)

Reflection is the sending back of light from the surface without absorbing it. In the reflection phenomenon, the wave does not continue moving forward.

Diffraction is the bending of the light around the obstacle. In the diffraction phenomenon, the wave travels forward after striking around the obstacle.

Therefore, the correct answer is A.

(2)

Amplitude is the maximum displacement in the medium from the rest position.

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Therefore, the correct option is D.

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2 years ago

If a roller coaster train has a potential energy of 1,500 J and a kinetic energy of 500 J as it starts to travel downhill, its t

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3 years ago

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Answer:

v₂ = 5.7 m/s

Explanation:

We will apply the law of conservation of momentum here:

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where,

Total Initial Momentum = 340 kg.m/s

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v₂ = final speed of Sheila = ?

Therefore,

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