NEET 2016 Phase 2 | Center of Mass and Collision Question 15 | Physics

NEET 2016 Phase 2

MCQ (Single Correct Answer)

-1

Two identical balls A and B having velocities of 0.5 m s^$$-$$1 and $$-$$0.3 m s^$$-$$1 respectively collide elastically in one dimension. The velocities of B and A after the collision respectively will be :

$$-$$0.5 m s^$$-$$1 and 0.3 m s^$$-$$1

0.5 m s^$$-$$1 and $$-$$0.3 m s^$$-$$1

$$-$$0.3 m s^$$-$$1 and 0.5 m s^$$-$$1

0.3 m s^$$-$$1 and 0.5 m s^$$-$$1

NEET 2016 Phase 2

MCQ (Single Correct Answer)

-1

A bullet of mass 10 g moving horizontally with a velocity of 400 m s^$$-$$1 strikes a wood block of mass 2 kg which is suspended by light inextensible string of length 5 m. As a result, the centre of gravity of the block found to rise a vertical distance of 10 cm. The speed of the bullet after it emerges out horizontally from the block will be

100 m s^$$-$$1

80 m s^$$-$$1

120 m s^$$-$$1

160 m s^$$-$$1

AIPMT 2015 Cancelled Paper

MCQ (Single Correct Answer)

-1

Two particles of masses m₁, m₂ move with initial velocities u₁ and u₂. On collision, one of the particles get excited to higher level, after absorbing energy $$\varepsilon $$. If final velocities of particles be v₁ and v₂ then we must have :

$${1 \over 2}$$m₁u$$_1^2$$ + $${1 \over 2}$$ m₂u$$_2^2$$ $$-$$ $$\varepsilon $$ = $${1 \over 2}$$ m₁v$$_1^2$$ + $${1 \over 2}$$m₂v$$_2^2$$

$${1 \over 2}$$m$$_1^2$$u$$_1^2$$ + $${1 \over 2}$$m$$_2^2$$u$$_2^2$$ + $$\varepsilon $$ = $${1 \over 2}$$m$$_1^2$$v$$_1^2$$ + $${1 \over 2}$$m$$_2^2$$v$$_2^2$$

m$$_1^2$$u₁ + m$$_2^2$$u₂ $$-$$ $$\varepsilon $$ = m$$_1^2$$v₁ + m$$_2^2$$v₂

$${1 \over 2}$$m₁u$$_1^2$$ + $${1 \over 2}$$m₂u$$_2^2$$ = $${1 \over 2}$$m₁v$$_1^2$$ + $${1 \over 2}$$m₂v$$_2^2$$ $$-$$ $$\varepsilon $$

AIPMT 2015 Cancelled Paper

MCQ (Single Correct Answer)

-1

Two spherical bodies of mass M and 5M and radii R and 2R are released in free space with initial separation between their centres equal to 12R. If they attract each other due to gravitational force only, then the distance covered by the smaller body before collision is :

7.5R

1.5R

2.5R

4.5R

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