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3 years ago

A car of mass 550 kg is moving at a speed of 1.5 m/s. A man pushes the car,

Physics

1 answer:

Ad libitum [116K]3 years ago

5 0

Answer:

C. 2197 J

Explanation:

The work done = Energy change

The work done by man = Kinetic energy change of the car

Kinetic energy is the energy possessed by a moving object solely due to its motion.

You can get the K.E. of an object using the equation,

K.E. = (1/2)mv²

So you get,

The work done by man = K.E. change of the car

= (1/2)×550×(3.2)² - (1/2)×550×(1.5)²

= 2197.25 J

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3 years ago

A wooden block with mass 1.60 kg is placed against a compressed spring at the bottom of a slope inclined at an angle of 30.0° (p

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Answer:

The amount of potential energy that was initially stored in the spring is 88.8 J.

Explanation:

Given that,

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Coefficient of kinetic friction = 0.50

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Using formula of conservation of energy between point A and B

$U_{A}+k_{A}+w_{A}=U_{B}+k_{B}$

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$U_{A}=88.8\ J$

Hence, The amount of potential energy that was initially stored in the spring is 88.8 J.

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3 years ago

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3 years ago