Given: Mass of a person M = 68.4 Kg.
Mass of earth Me = 5.98 x 10²⁴ Kg
Radius of earth r = 6.37 x 10⁶ m
G = 6.67 x 10⁻¹¹ N.m²/Kg²
Required: F = ?
Formula: F = GMeM/r²
F = (6.67 x 10⁻¹¹ N.m²/Kg²)(5.98 x 10²⁴)(68.4 Kg)/(6.37 x 10⁶ m)²
F = 672.41 N
To solve this problem we will apply the linear motion kinematic equations, specifically the concept of acceleration as a function of speed and time, as well as Newton's second law.
PART A) Acceleration can be described as changing the speed in a period of time therefore,

Force is the proportional change between mass and acceleration therefore


PART B) We will apply the same concept given but now we will change the time to 21s therefore:

Now the force


Inertia I think because I've heard it around school and in science
The distance it traveled and the time that it took to travel that distance
A) Metal expand upon heating. B) Alloys expand less upon heating than elemental metals. C) Alloys expand more upon heating than elementals metals. D) The rate of the expansion of metals is directly proportion to the temperature to which it is heated