Question

a book has a mass 400 gram find its weight and taken from surface to a height equal to radius of earth

Answer 1

mass is 400 gm that is 0.4 kg.
weight is mass x gravity
w=0.4 x 9.8
w = 3.92 N

Answer 2

mass of book =400g= 0.4 kg

weight = m × g

W= 0.4 × 9.8 = 3.92 N