a 20 kg body is taken to a planet where the acceleration due to to gravity is 3 times thst of the earth. what is the weight of this body on the surface of thus planet (take g=10m/s2) plzzz

Awoman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. the book has a mass of m = 1.8 kg and the coefficient of static friction between her hand and the book is μs = 0.67. no attempt 50% part (a) what is the weight of the book, fgb in newtons?