1

JEE Main 2019 (Online) 12th April Evening Slot

MCQ (Single Correct Answer)

+4

-1

Three particles of masses 50 g, 100 g and 150 g are placed at the vertices of an equilateral triangle of side
1 m (as shown in the figure). The (x, y) coordinates of the centre of mass will be :

2

JEE Main 2019 (Online) 12th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

A man (mass = 50 kg) and his son (mass = 20 kg) are standing on a frictionless surface facing each other. The
man pushes his son so that he starts moving at a speed of 0.70 ms

^{–1}with respect to the man. The speed of the man with respect to the surface is :3

JEE Main 2019 (Online) 10th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

Two particles, of masses M and 2M, moving,
as shown, with speeds of 10 m/s and 5 m/s,
collide elastically at the origin. After the
collision, they move along the indicated
directions with speeds u

_{1}and u_{2}, respectively. The values of u_{1}and u_{2}are nearly :4

JEE Main 2019 (Online) 9th April Evening Slot

MCQ (Single Correct Answer)

+4

-1

A particle of mass 'm' is moving with speed '2v'
and collides with a mass '2m' moving with
speed 'v' in the same direction. After collision,
the first mass is stopped completely while the
second one splits into two particles each of
mass 'm', which move at angle 45° with respect
to the origianl direction.
The speed of each of the moving particle will
be :-

Questions Asked from Center of Mass and Collision (MCQ (Single Correct Answer))

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