1
WB JEE 2025
MCQ (Single Correct Answer)
+1
-0.25
Change Language

A ball falls from a height $h$ upon a fixed horizontal floor. The co-efficient of restitution for the collision between the ball and the floor is ' $e$ '. The total distance covered by the ball before coming to rest is [neglect the air resistance]

A
$\frac{1-e^2}{1+e^2} h$
B
$\frac{1+e^2}{1-e^2} h$
C
$\frac{1-2 e^2}{1+e^2} h$
D
$\frac{1+2 e^2}{1-e^2} h$
2
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
Change Language

WB JEE 2024 Physics - Center of Mass Question 1 English

The position of the centre of mass of the uniform plate as shown in the figure is

A
$$\left(-\frac{\mathrm{a}}{2},-\frac{\mathrm{b}}{2}\right)$$
B
$$\left(\frac{\mathrm{a}}{8}, \frac{\mathrm{b}}{8}\right)$$
C
$$\left(-\frac{\mathrm{b}}{6},-\frac{\mathrm{a}}{6}\right)$$
D
$$\left(-\frac{a}{6},-\frac{b}{6}\right)$$
3
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
Change Language

A particle of mass m is projected at a velocity u, making an angle $$\theta$$ with the horizontal (x-axis). If the angle of projection $$\theta$$ is varied keeping all other parameters same, then magnitude of angular momentum (L) at its maximum height about the point of projection varies with $$\theta$$ as,

A
WB JEE 2023 Physics - Center of Mass Question 3 English Option 1
B
WB JEE 2023 Physics - Center of Mass Question 3 English Option 2
C
WB JEE 2023 Physics - Center of Mass Question 3 English Option 3
D
WB JEE 2023 Physics - Center of Mass Question 3 English Option 4
4
WB JEE 2023
MCQ (Single Correct Answer)
+2
-0.5
Change Language

There are n elastic balls placed on a smooth horizontal plane. The masses of the balls are $$\mathrm{m}, \frac{\mathrm{m}}{2}, \frac{\mathrm{m}}{2^{2}}, \ldots \frac{\mathrm{m}}{2^{\mathrm{n}-1}}$$ respectively. If the first ball hits the second ball with velocity $$\mathrm{v}_{0}$$, then the velocity of the $$\mathrm{n}^{\text {th }}$$ ball will be,

A
$$\frac{4}{3} v_{0}$$
B
$$\left(\frac{4}{3}\right)^{n} v_{0}$$
C
$$\left(\frac{4}{3}\right)^{n-1} v_{0}$$
D
$$\mathrm{v}_{0}$$
WB JEE Subjects
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12