help with 3,4, &5 Question 3 (2 points) calculate the kinetic energy of a 60 kg

Question

help with 3,4, &5

Question 3 (2 points) calculate the kinetic energy of a 60 kg mass moving with velocity 22 m/s. Give the answer to 1 decimal place. Your Answer: Answer units Save Question 4 (2 points) How much work is required to increase the velocity of a 90 ko mass from 10 m/'s to 55 m/s2 Give the answer to 1 decimal place. Your Answer: Answer Save Question 5 (2 points) Calculate the work done by gravity when a 6 kg mass is raised from a height of 2 m to 18 m. Give the answer to 1 decimal place

Explanation / Answer

3.

Kinetic energy is given by:

KE = m*V^2/2 = 60*22^2/2 = 14520 J

4.

Using Work-energy theorem:

W = dKE

W = m*Vf^2/2 - m*Vi^2/2

W = (m/2)*(Vf^2 - Vi^2)

W = (90/2)*(55^2 - 10^2)

W = 131625 J

5.

Work-done by gravity is given by:

W = dPE = PEf - PEf

W = m*g*hf - m*g*hi

W = m*g*(hf - hi)

W = 6*9.8*(18 - 2)

W = 940.8 J

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