An 80 kg runner has 3,000 J of kinetic energy. What is her velocity in m/s? Question An 80 kg runner has 3,000 J of kinetic energy. What is her velocity in m/s? in progress 0 Physics Farah 3 years 2021-08-19T18:36:59+00:00 2021-08-19T18:36:59+00:00 1 Answers 7 views 0
Answers ( )
Answer: 8.6m/s
Explanation:From KE=1/2mv^2
In order to make v the subject of the formula we divide both sides by 1/2m. Thus V^2 will be left alone on the RHS. But we are looking for v and not v^2. Thus we find the square root of KE1/2m
Meaning V= sqrt[3000÷1/2 of 80]
=sqrt[3000÷40]
=sqrt(75)
=8.6m/s