Question

please helpppppppp
A boy of mass 40 kg walks up a flight of stairs to a vertical distance of 12 m in a time interval of 40 s. With respect to this answer the questions that follow: [Take g=10 N/kg]
(i) Weight of the boy is:

1. 40 Kg

2. 40 N

3. 400 kg

4. 400 N

Answer…………….

(ii) Work done by the boy will

be: 1. 4000 J

2. 4200 J

3. 4600 J

4. 4800 J

Answer…………….

(iii) Power exerted by the boy will

be: 1. 100 W

2. 120 W

3. 140 W

4. 160 W

Answer……………

(iv)The type of work done by the person will be:

1. Negative

2. Positive

3. Zero

4. Information is insufficient to conclude
​

Answer 1

Explanation:

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