Question

If an object of mass 5 kg is lifted from ground to the top of the table which is 2 m above the ground then calculate the
work done by the gravitational force acting on the object.
Select one:
A +98J
B. -98J
C. 0J
D. 15J​

Answer 1

Answer:

B. -98J

Explanation:

Work done = force x distance

W = F.d

• as the force due to gravity (weight) is equal to "mg"
• since the force (gravity) is opposite to the displacement, therefore it's value will be negative

W= -(mg).d

putting the values,

W= -(5 x 9.8) x 2

   = -49 x 2

  =  -98J