Courses
Courses for Kids
Free study material
Offline Centres
More
Store Icon
Store
seo-qna
SearchIcon
banner

An object of mass 1kg travelling in a straight line with a velocity of 10ms1 collides with, and sticks to, a stationary wooden block of mass 5kg. Then they both move off together in the same straight line. Calculate the total momentum just before the impact and just after the impact. Also, calculate the velocity of the combined object.

Answer
VerifiedVerified
486.9k+ views
like imagedislike image
Hint: The concept of conservation of linear momentum is to be applied here.
Linear momentum is the product of mass and the velocity of the object in which the object is moving. It is a vector quantity.As the motion is one dimensional linear momentum to be conserved in the X direction only.In an isolated system, where no external force is acting the linear momentum of the body is always conserved. This is the law of conservation of linear momentum.

Complete answer:
As the motion is one dimensional linear momentum to be conserved in the X direction only.
The final momentum will be due to the combined velocity of both masses as after collision, both masses move off together.

Mass of the first object (m1)=1kg

Initial Velocity of first object(v1)=10ms1
Mass of the wooden block (m2)=5kg
Velocity of the wooden block before collision(v2)=0ms1
Total momentum before collision
m1v1+m2v2
10(1)+5(0)
10kgms1
It is given that after collision, the object and the wooden block stick together.
Total mass of the system after collision = m1+m2
Let combined velocity be V
According to the law of conservation of momentum,
Total momentum before collision = Total momentum after collision
m1v1+m2v2=(m1+m2)V
10=6V
V=53ms1.
The total momentum after collision is 6×53=10kgms1
Total momentum just before the impact 10kgms1
Hence, velocity of the combined object after collision V=53ms1

Note:
Conservation of linear momentum finds its application in a variety of placesOne of the best examples of this is in rocket propulsion in space,there is no medium in space to exert a force on,the rocket system forms an isolated system with no external force acting.Linear momentum is a vector quantity and it needs to be added considering laws of vector addition.
Latest Vedantu courses for you
Grade 10 | MAHARASHTRABOARD | SCHOOL | English
Vedantu 10 Maharashtra Pro Lite (2025-26)
calendar iconAcademic year 2025-26
language iconENGLISH
book iconUnlimited access till final school exam
tick
School Full course for MAHARASHTRABOARD students
PhysicsPhysics
BiologyBiology
ChemistryChemistry
MathsMaths
₹36,600 (9% Off)
₹33,300 per year
Select and buy