Can anyone please answer Question 5 (a)
Answers
Answer:
Work done = Force × displacement
= mg × 50 m = 50 × 9.8 × 50 = 24,500 Nm = 24,500 J = 24.5 KJ
Note:
Here we take the mass of the box that's being lifted not that of man, this is because the force that needs to applied in order to lift the box should be equal to its weight which is pulling it down. The mass of the man is basically given to confuse us.
Answer:
Work Done When :-
g = 10 m/s² is 25000 J
g = 9.8 m/s² is 24500 J
Explanation:
We Have :-
Mass of Box = 50 kg
Mass of Man = 60 Kg
Lifted to Height = 50 m
To Find :-
Work done
Formula Used :-
Work done = Force * Displacement
Weight = Mass * Gravity
Solution :-
Weight = Mass * Gravity
= 50 * 10 ( Assuming g = 10 m/s² )
= 500 N
Work Done = Force * Displacement
= 500* 50
= 25000 J
Total Work Done is 25000 J
Weight = Mass * Gravity
= 50 * 9.8 ( Assuming g = 9.8 m/s² )
= 490N
Work Done = Force * Displacement
= 490 * 50
= 24500 J