Question

What is the work done by a person in carrying
a Suitcase weighing 10kg on his head when he travels
a distance of 5m in the vertical direction (g=9.8m/s^2)​

Answer 1

Answer:

mass=10 kg

distance = 5

work done = f× d

10×5

= 50

Answer 2

Answer:

Work Done = Force × Displacement

If there is an angle change in the force direction, then the formula would be :

Work Done = Force × Displacement × Cos Ф

Now here the suitcase is being carried perpendicular to the ground and displacement is parallel to the ground.

Hence Work Done = Force × Displacement × Cos Ф

=> Work Done = 10 kg f × 5 m × Cos 90

We know that Cos 90 = 0

Hence anything multiplied by 0 is zero.

Hence Work Done = 5 × 10 × 0 = 0 J