Question

Calculate the work done by a force of 30 N in lifting a load of 2 kg to a height of 10 m (g = 10 m/s2)

F=mg
F= 2 (kg) × 10 (m/s2) = 20 N
W= Fd = mgh
W= 20 × 10 = 200 J

Guys, please answer. If the relationship gives a product of 20 N, why is 30 N in the question?​

Answer 1

300 J

Step-by-step explanation:

Given :

1. Applied force = 30 N
2. Mass = 2 kg
3. Height = 10 m
4. g = 10 m/s²

Work done by the force :

• Work done = Force x Displacement
• Work done = mg x h
• Work done = 30 N x 10 m
• Work done = 300 J

Note :

• What you have calculated is the work done by gravitational force on the object (that too, incorrectly)
• But in the end, it asks for work done by the force of 30N
• Hence, the given answer ~