Question

calculate the increase in kinetic energy of a
body of mass 400 g, when its speed
increase from 5m/s to 8 m/s.
O 78J
0.78 J
O
7.8 J
O 780 J​

Answer 1

Answer:

kinetic energy = (1/2) mv²

Explanation:

K = (1/2) × 0.4×8×8

= 12.8J

K' = (1/2)×0.4×5×5

= 5J

Increase in kinetic energy = 12.8-5

= 7.8J