Question

Workman
Workman 2
a) Workman 1 drops a hammer, which falls to the ground.
The hammer has a mass of 2.0 kg, and is dropped from a
height of 4.8 m above the ground. (g = 10m/s?)
(i) Calculate the change in gravitational potential
energy of the hammer when it is dropped.
(ii) Describe the energy changes from the time the
hammer leaves the hand of workman 1 until it is
at rest on the ground.
b) Workman 2 picks up the hammer and takes it back, up the
ladder to workman 1. He climbs the first 3.0 m in 5.0 s. His
total weight, including the hammer, is 520 N.
Calculate the power which his legs are producing.​

Answer 1

Given : Workman 1 drops a hammer, which falls to the ground.  The hammer has a mass of 2.0 kg, and is dropped from a  height of 4.8 m above the ground. (g = 10m/s?)

climbs the first 3.0 m in 5.0 s. His  total weight, including the hammer, is 520 N.

To Find : Calculate the change in gravitational potential  energy of the hammer when it is dropped.

(ii) Describe the energy changes from the time the  hammer leaves the hand of workman 1 until it is  at rest on the ground.

Calculate the power which his legs are producing.​

Solution:

The hammer has a mass of  m = 2.0 kg

Dropped from a  height of  h = 4.8 m above the ground.

g = 10 m/s²

PE = mgh = 2 * 10 x 4.8 = 96 Joule

KE = 0  as at rest

TE = 96 Joule

PE at ground = 0   as h = 0

Hence change in PE = 0 - 96 = - 96 Joule

PE converted into KE and then converted into Heat/Sound Energy.

Work done = 520 x 3  = 1560 joule

power  = Work done/ Time

=> Power = 1560/5

=> Power = 312 J/s

Learn More:

Which of the following pairs are similar?(A) work and power(B ...

https://brainly.in/question/4625412

For work to be performed, energy must be …. Choose one or more ...

https://brainly.in/question/4546631

Answer 2

This is the answer including the question

Hope it helps

thank you !!