The decrease in the potential energy of a ball of mass 20 ~kg whi… - Vidyadip

MCQ

The decrease in the potential energy of a ball of mass $20 \mathrm{~kg}$ which falls from a height of $50 \mathrm{~cm}$ is

A
$968 \mathrm{~J}$
✓
$98 \mathrm{~J}$
C
$1980 \mathrm{~J}$
D
None of these

✓

Answer

Correct option: B.

$98 \mathrm{~J}$

(b) $\Delta U=m g h=20 \times 9.8 \times 0.5=98 \mathrm{~J}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "MCQ" from Surface Tension→Surface Tension — all question types→JEE physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

A train of 150 meter length is going towards north direction at a speed of $10 m / sec$. A parrot flies at the speed of $5 m / sec$ towards south direction parallel to the railway track. The time taken by the parrot to cross the train is

A convex lens of focal length $12 \mathrm{~cm}$ is made of glass of $\mu=\frac{3}{2}$.What will be its focal length when immersed in liquid of $\mu=\frac{5}{4}$

The equation of a wave travelling on a string is $y=4 \sin \frac{\pi}{2}\left(8 t-\frac{x}{8}\right)$. If $x$ and $y$ are in $\mathrm{cm}$, then velocity of wave is

When diameter of the aperture of the objective of an astronomical telescope is increased, its

In general in an alternating current circuit

Neutral temperature of a thermocouple is defined as the temperature at which

Which statement is correct

A $4 \mu F$ conductor is charged to $400$ volts and then its plates are joined through a resistance of $1 k \Omega$. The heat produced in the resistance is

For an isotropic medium $B, \mu, H$ and $M$ are related as (where $B, \mu_0, H$ and $M$ have their usual meaning in the context of magnetic material

To avoid slipping while walking on ice, one should take smaller steps because of the