Question

The force of gravity acting on a child's mass on earth is 490 newtons. Whats the child's mass?

A. 206 kg
B. 800 kg
C. 50 kg
D. 4802 kg

Answer 1

C. 50 kg

Step-by-step explanation:

Force of gravity on an object is the weight of the object and is given by mass times acceleration due to gravity. The acceleration due to gravity is the acceleration of an object in free fall and is given by 9.8m/s^2. Given that the force of gravity acting on a child's mass on earth is 490 newtons, i.e. F = mg which means that 490 newtons = 9.8 times mass. Therefore, mass of the child is 490 / 9.8 = 50 kg.

Answer 2

Force of gravity on an object is the weight of the object and is given by mass times accerelation due to gravity. The accerelation due to gravity is the accerelation of an object in free fall and is given by 9.8m/s^2. Given that the force of gravity acting on a child's mass on earth is 490 newtns, i.e. F = mg which means that 490 newtons = 9.8 times mass. Therefore, mass of the child is 490 / 9.8 = 50 kg.