KCET 2025 | Center of Mass and Collision Question 2 | Physics

Three particles of mass $1 \mathrm{~kg}, 2 \mathrm{~kg}$ and 3 kg are placed at the vertices A, B and C respectively of an equilateral triangle ABC of side 1 m . The centre of mass of the system from vertex A (located at origin) is

$\left(\frac{7}{12}, \frac{3 \sqrt{3}}{12}\right)$

$\left(\frac{9}{12}, \frac{3 \sqrt{3}}{12}\right)$

$\left(\frac{7}{12}, \frac{6+3 \sqrt{3}}{12}\right)$

$(0,0)$

KCET 2022

MCQ (Single Correct Answer)

-0

The centre of mass of an extended body on the surface of the earth and its centre of gravity

are always at the same point only for spherical bodies.

can never be at the same point.

centre of mass coincides with the centre of gravity of a body if the size of the body is negligible as compared to the size (or radius) of the earth.

are always at the same point for any size of the body.

KCET 2021

MCQ (Single Correct Answer)

-0

A $$1 \mathrm{~kg}$$ ball moving at $$12 \mathrm{~ms}^{-1}$$ collides with a $$2 \mathrm{~kg}$$ ball moving in opposite direction at $$24 \mathrm{~ms}^{-1}$$. If the coefficient of restitution is $$2 / 3$$, then their velocities after the collision are

$$-4 \mathrm{~ms}^{-1},-28 \mathrm{~ms}^{-1}$$

$$-28 \mathrm{~ms}^{-1},-4 \mathrm{~ms}^{-1}$$

$$4 \mathrm{~ms}^{-1}, 28 \mathrm{~ms}^{-1}$$

$$28 \mathrm{~ms}^{-1}, 4 \mathrm{~ms}^{-1}$$

KCET 2021

MCQ (Single Correct Answer)

-0

A ball hits the floor and rebounds after an inelastic collision. In this case

the momentum of the ball is conserved

the mechanical energy of the ball is conserved

the total momentum of the ball and the earth is conserved

the total mechanical energy of the ball and the earth is conserved

PREVIOUS NEXT

KCET Subjects