Brad tries out a weight-loss plan that involves repeatedly lifting a 52.0-kg barbell from the floor over his head to a height of 2.3 m. If he is able to complete three such lifts per minute, how long will it take for him to lose 0.50 kg of fat? "

The given question is incomplete. The complete question is as follows.

Brad tries out a weight-loss plan that involves repeatedly lifting a 52.0-kg barbell from the floor over his head to a height of 2.3 m. If he is able to complete three such lifts per minute, how long will it take for him to lose 0.50 kg of fat? "Burning" 1 g of fat supplies 39 kJ to the body; of this, 10% can be used by the muscles to lift the barbell. (Ignore the fat "burned" while he lowers the barbell to the floor.)

Explanation:

For the given situation,

    Energy given by his "fat" = work done by the gravity

                 t = 25595.52 seconds

As there are 3600 seconds present in 1 hour. So, convert 25595.52 seconds into hours as follows.

             = 7.10 hours

Thus, we can conclude that it will take 7.10 hours from Brad to lose 0.50 kg of fat.

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can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s