Question

12. A man weighs 60 kg climb up a stair case with a 20 kg load on his
head. The stair case has 20 steps and each step has a height 20 cm. The
increase in potential energy of the man is. (g=10 m/s)
1) 3.5 KJ 2) 4.5 KJ
3) 8.1 KJ
4)3.2 KJ

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Answer 1

Answer:

Option 4

Explanation:

★ POTENTIAL ENERGY ★

P.E. = mass ( m ) × gravity ( g ) × height ( h )

= ( 60 + 20 ) × 10 × ( 20 Steps × 20 cm )

= 80 × 10 × 400 cm [ 1m = 100 cm ]

= 800 × 4

= 3200 Joules

P.E. = 3.2 × 10³ Joules or 3.2 K J

MARK IT AS BRAINLIEST

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Answer 2

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