You visited us 11 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard VII

Physics

Energy

A metal ball ...

Question

A metal ball of mass $2 k g$ is allowed to fall freely from rest from a height of $5 m$ above the ground (Take $g = 10 m s^{- 2}$ ). Calculate the potential energy possessed by the ball when initially at rest.

0 J

No worries! We‘ve got your back. Try BYJU‘S free classes today!

10 J

No worries! We‘ve got your back. Try BYJU‘S free classes today!

100 J

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

1000 J

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is C $100 J$
When ball is at rest it will have only Potential Energy that is

$P . E = m g h$

$m = 2 k g; h = 5 m$

$P . E = 2 \times 10 \times 5 = 100 J$

Hence total energy when ball is at rest is $100 J$ .

Suggest Corrections

Similar questions

A metal ball of mass 2 kg is allowed to fall freely from rest from a height of 5 m above the ground.

(a) Taking g=10 m $s^{- 2}$ ,calculate:

(i) the potential energy possessed by the ball when it is initially at rest.

(ii) the kinetic energy of the ball just before it hits the ground?

(b) What happens to the mechanical energy after the ball hits the ground and comes to rest?

Q. A metal ball of mass

2 k g

is allowed to fall freely from rest from a height of

5 m

above the ground (Take

g = 10 m s^{- 2}

). After the ball hits the ground and comes to rest, mechanical energy is converted to:

Q. A metal ball of mass

2 k g

is allowed to fall freely from rest from a height of

5 m

above the ground (Take

g = 10 m s^{- 2}

). What is the kinetic energy of the ball just before it hits the ground?

We know that If a ball of mass $1 k g$ is kept at a height $10 m$ possess potential energy $m g h$ i.e. $(1 \times 10 \times 10) = 100$ J. (Taking earth surface as reference, where m = mass of object, g = acceleration due to gravity, h = height of object from earth surface.) what will be the kinetic energy of the ball when the ball is allowed to freely fall from a height $10 m$ just before it hits the ground? (take g = 10 $m / s^{2}$ and neglect air drag)

Q. A body of mass

5 k g

falls from a height of

10 m

4 m

. (Take

g = 10 m s^{- 2}

). Calculate the total energy possessed by the body at any instant?

Join BYJU'S Learning Program

A metal ball of mass 2kg is allowed to fall freely from rest from a height of 5m above the ground (Take g=10ms−2). Calculate the potential energy possessed by the ball when initially at rest.

The correct option is C 100JWhen ball is at rest it will have only Potential Energy that isP.E=mghm=2 kg;h=5 mP.E=2×10×5=100JHence total energy when ball is at rest is 100J.

A metal ball of mass $2 k g$ is allowed to fall freely from rest from a height of $5 m$ above the ground (Take $g = 10 m s^{- 2}$ ). Calculate the potential energy possessed by the ball when initially at rest.

The correct option is C $100 J$
When ball is at rest it will have only Potential Energy that is

$P . E = m g h$

$m = 2 k g; h = 5 m$

$P . E = 2 \times 10 \times 5 = 100 J$

Hence total energy when ball is at rest is $100 J$ .