Question

Find the increase in kinetic energy of a body of mass 1000g, when its speed increases from 2ms-1 to 4ms-1

Answer 1

Answer:

Explanation:

Initial kE = ½mv²

½×1×2² =2 J

Similarly final KE

½×1×4×4 =8J

increase in kE = final KE- initial kE/initial KE×100

8-2/2×100 =300% increment