Two cars approach each other; both cars are moving westward, one at 79 km/h, the other at 60 km/h. (a) what is the velocity of the first car relative to (in the reference frame of) the second car

Explanation:

Given that,

There are two cars say A and B. Both are approaching each other moving towards westward.

Speed of car A,

Speed of car B,

We need to find the velocity of the first car relative to (in the reference frame of) the second car. As both are moving in same direction, there relative velocity is given by :

v' = 19 km/h

So, the velocity of car A with respect to car B is 19 km/hr. Hence, this is the required solution.

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.