Two bodies A and B move toward each other with speeds of 80 cm/s and 40 cm/s, respectively. The mass of A is 140 g and that of B is 60 g. After a head-on, perfectly elastic collision, the speed of B is

The speed of body B after collision is 128 cm/s

Explanation:

Given;

initial speed of body A, = 80 cm/s (forward direction)

initial speed of body B, = - 40 cm/s (backward direction)

mass of body A, = 140 g

mass of body B, = 60 g

let the speed of body A after collision =

let the speed of body B after collision =

Apply the principle of conservation of linear momentum;

One direction velocity;

substituting the value of Va in the first equation, we will have;

Therefore, the speed of body B after collision is 128 cm/s

this allows people to make the best decision or pursue the best option. when alternatives are weighed using their advantages and disadvantages, the option whose disadvantages outweigh the advantages (based on a qualitative or quantitative analysis) are shunned while those whose advantages outweigh their disadvantages are pursued.