Question

boy of mass 50 kg runs up a staircase of 45 steps. If the height of each step is 15 cm, find  the work done. Take g = 10 m/s2​

Answer 1

Answer:

• Work done by the boy is 3375 Joules.

Explanation:

According to the Question

It is given that,

• Mass ,m = 50kg
• No. of staircase = 45
• Height of each step = 15cm
• Acceleration due to gravity ,g = 10m/s²

We have to calculate the work done by the boy.

Calculating Height attained by boy

→ Height = 45×15

→ Height = 675 cm

→ Height = 6.75 m

Here, the work done by the boy is

• Work Done = mgh

On substituting the value we get

↠ Work Done = 50×10×6.75

↠ Work Done = 500×6.75

↠ Work Done = 3375J

• Hence, the work done by the boy is 3375 Joules .

Answer 2

Answer:

=3375J

Explanation:

Total height= 45×15cm

=675cm

=6.75m

Work= mgh

=(50)(10)(6.75)

=3375J