Question

How Much the power is used by a 40kg athlete in climing a 10m high ladder in 10s? Class 9

Answer 1

Answer:

40 N

Explanation:

F  = m * a

F= force

a= acceleration

m=mass

here a = dv/dt

v=10/10 = 1 m/s

dv/dt = 1

a= 1 m/sec²

F = 40 x 1 = 40 N

Answer 2

The power of the man is 392 watts.

Explanation:

Given that,

Mass of the athlete, m = 40 kg

height at which the athlete climbs, h = 10 m

Time, t = 10 s

We need to find the power used by the man. It is equal to the work done divided by time taken such that,

$P=\dfrac{W}{t}=\dfrac{mgh}{t}$

$P=\dfrac{40\times 9.8\times 10}{10}$

P = 392 watts

So, the power of the man is 392 watts. Hence, this is the required solution.

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