Question

the car of mass 1500 kg travelling at 25 metre per second collides with another car b of mass 1000 kg travelling at 15 metre per second in same direction after collision the velocity of kahe becomes 20 metre per second

what is the momentum of car A before collision

what is the total momentum of car A and car B before collision .

what is the right expression for conservation of momentum


plz tell the answer . ​

Answer 1

Answer:

the speed of the car B is 22.5 m/s.

Explanation:

Complete step by step answer:

According to the law of conservation of momentum,

Initial momentum = Final momentum.

Thus, we write this as follows:

m1u1+m2u2=m1v1+m2v2……..(1)

Here, m1=1500kg is the mass of the car A.

m2=1000kg is the mass of the car B.

u1=25m/s is the initial velocity of the car A.

u2=15m/s is the intial velocity of the car B.

v1=20m/s is the final velocity of the car A.

v2=? is the final velocity of the car B.

From equation (1),

1500×25+1000×15=1500×20+1000×v2

37500+15000=30000+1000×v2

52500=30000+1000×v2

1000×v2=52500−30000

1000×v2=22500

v2=22.5m/s

Thus, the speed of the car B is 22.5 m/s.

Note:

Velocity is the vector quantity, the numerical value of the velocity is either positive or negative depending on the direction stated for the motion of an object. If two objects are in the same direction then the velocity is positive, if both are moving in opposite directions then one of the velocity of the object is negative.