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3 years ago

A man lifts a load of 20 kg Frome The ground And put it on his head 1.4m above the ground . Calculate the work done by the man.

Physics

1 answer:

Leni [432]3 years ago

5 0

Given parameters:

Mass of load = 20kg

Height of man = 1.4m

Unknown:

Work done by man = ?

Work done is the force applied to move a body in a particular direction.

Often times, it is mathematically expressed as;

Work done = Force x distance

In this problem, we use the formula of potential energy to find the work done;

Work done = Potential energy = mgh

where m is the mass of the load

g is the acceleration due to gravity = 9.8m/s²

h is the height of the body

Now, input the parameters, and solve for work done;

Work done = 20 x 9.8 x 1.4 = 274.4J

The work done by man is 274.4J

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3 years ago

A woman walked 115 m. As she did so, her speed increased from 4.20 m/s to 5.00 m/s. How long did it take her to walk this distan

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3 years ago

20 kg object travels 28 meter and stops. coefficient friction= 0.085 how much work was done by friction?

Tresset [83]

Assuming it is on a horizontal surface:
friction = μR
R = 20g (g is gravity 9.81)
so Friction = 0.085 x 20g
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so Work done = 0.085 x 20g x 28
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3 years ago

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2 years ago