Question

a 75kg man walks up a flight of 10 steps, each 10 cm high. calculate the work done if g=10m/s². (3 with explanation) ​

Answer 1

To Find :-

• The work done by a man.

Solution :-

• Mass (m) = 75 kg

• Total height gained (h) = 10 × 10 cm → 100 cm → 1 m

• Acceleration due to gravity (g) = 10 m/s²

Now,

Work done by a man,

$\red\bigstar$ W = mgh

Where,

• W → Work done by a man
• m → Mass of a man
• g → Acceleration due to gravity
• h → height of a man

[ Put the values ]

$\longrightarrow$ W = 75 × 10 × 1

$\longrightarrow$ W = 75 × 10

$\longrightarrow$ W = 750 joule $\green\bigstar$

Therefore,

The work done by a man is 750 J.

Answer 2

Explanation:

Given:-

Mass=75kg

Total height gained =10×10=100cm=1m

G=10m/s^2

To find:-

The work done by the man=W

Solution:-

As we know that

${:}\longrightarrow$${\boxed{W=mgh}}$

${:}\longrightarrow$$W=75×10×1$

${:}\longrightarrow$$75×10$

${:}\longrightarrow$$750Joule$

${:}\longrightarrow$${\underline{\boxed {\bf {W=750J}}}}$