Question

how to solve this 1997 is year name of exam do not bother it.​

Answer 1

GIVEN:

• mass of the boy=40 kg

• energy supplied =21 K J = 21000J

• efficiency =28%

SOLUTION:

As per the formula ,

efficiency = available energy / energy supplied

available energy

= efficiency × energy supplied

= 28×21000/100

= 5880 J

available energy = 5880 J

While climbing this available energy gets converted into potential energy

Potential energy = available energy= 5880J

Potential energy = m × g × h

h = 5880 /10 × 40

h=14.7 m

height =14.7 m