JEE Main 2020 (Online) 9th January Evening Slot | Center of Mass and Collision Question 64 | Physics

JEE Main 2020 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

-1

A particle of mass m is projected with a speed u from the ground at an angle $$\theta = {\pi \over 3}$$ w.r.t. horizontal (x-axis). When it has reached its maximum height, it collides completely inelastically with another particle of the same mass and velocity $$u\widehat i$$ . The horizontal distance covered by the combined mass before reaching the ground is:

$$2\sqrt 2 {{{u^2}} \over g}$$

$${{3\sqrt 3 } \over 8}{{{u^2}} \over g}$$

$${{3\sqrt 2 } \over 4}{{{u^2}} \over g}$$

$${5 \over 8}{{{u^2}} \over g}$$

JEE Main 2020 (Online) 9th January Morning Slot

MCQ (Single Correct Answer)

-1

Two particles of equal mass m have respective
initial velocities $$u\widehat i$$ and $$u\left( {{{\widehat i + \widehat j} \over 2}} \right)$$.
They collide completely inelastically. The energy lost in the process is :

$${1 \over 3}m{u^2}$$

$${1 \over 8}m{u^2}$$

$${3 \over 4}m{u^2}$$

$$\sqrt {{2 \over 3}} m{u^2}$$

JEE Main 2020 (Online) 8th January Evening Slot

MCQ (Single Correct Answer)

-1

A particle of mass m is dropped from a height h above the ground. At the same time another particle of the same mass is thrown vertically upwards from the ground with a speed of $$\sqrt {2gh} $$. If they collide head-on completely inelastically, the time taken for the combined mass to reach the ground, in units of $$\sqrt {{h \over g}} $$ is :

$$\sqrt {{1 \over 2}} $$

$${1 \over 2}$$

$$\sqrt {{3 \over 2}} $$

$$\sqrt {{3 \over 4}} $$

JEE Main 2019 (Online) 12th April Evening Slot

MCQ (Single Correct Answer)

-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 : JEE Main 2019 (Online) 12th April Evening Slot Physics - Center of Mass and Collision Question 67 English