You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard XII

Physics

Gravitational Potential Energy

A person brin...

Question

A person brings a mass of 1 kg from intensity to a point A Initially the mass was at rest but it moves with a speed of 2 m/s as it reaches A The work done by the person on the mass is -3J The potential of A is

- 3 J/kg

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

-2 J/kg

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

-5 J/kg

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

-7 J/kg

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

Open in App

Solution

The correct option is B -5 J/kg
$∵ W = Δ K E$
$∴ W_{p e r s o n} + W_{f i e l d} = 1 / 2 m v^{2} \Rightarrow W_{p e r s o n} + U_{1} - U_{2} = 1 / 2 m v^{2}$
$\Rightarrow - 3 + (0 - V_{A}) \times 1 = 1 / 2 \times 1 \times 2^{2} \Rightarrow V_{A} = - 5 J / k g$

Suggest Corrections

Similar questions

Q. A person brings a mass of

1 k g

from infinity to a point

A

. Initially the mass was at rest but it moves at a speed of

2 m / s

as it reaches

A

. The work done by a person on the mass is

3 J

. The potential at

A

is:

Q. A person brings a mass of

1 kg

from infinity to a point

A

. Initially the mass was at rest but it moves at a speed of

2 m/s

as it reached

A

. The work done by the person on the mass is

- 3 J

. The potential at

A

Q. A person brings a mass of 1 kg from infinity to a point A. Initially the mass was at rest but it moves at a speed of 2 m s ⁻¹ as it reaches A. The work done by the person on the mass is −3 J. The potential at A is
(a) −3 J kg⁻¹
(b) −2 J kg⁻¹
(c) −5 J kg⁻⁴
(d) none of these.

Q. A person bring a mass of

1 k g

from infinite to point

A

. Initially the mass was at rest but is moves a speed of

2 m / s

as it reaches to

A

. The workdone by the person on mass is

- 3 J

the gravitational potential at

A

Q. An object of mass

5 kg

is moved from infinity to a point

A

. Initially the object was at rest but on reaching

A

, its speed becomes

5 m/s

. If the work done in moving that object is

- 25 J

, then find the ratio of potential energy to mass at point

A

(in

J/kg

) is

Join BYJU'S Learning Program

A person brings a mass of 1 kg from intensity to a point A Initially the mass was at rest but it moves with a speed of 2 m/s as it reaches A The work done by the person on the mass is -3J The potential of A is

The correct option is B -5 J/kg∵W=ΔKE∴Wperson+Wfield=1/2mv2⇒Wperson+U1−U2=1/2mv2⇒−3+(0−VA)×1=1/2×1×22⇒VA=−5J/kg

The correct option is B -5 J/kg
$∵ W = Δ K E$
$∴ W_{p e r s o n} + W_{f i e l d} = 1 / 2 m v^{2} \Rightarrow W_{p e r s o n} + U_{1} - U_{2} = 1 / 2 m v^{2}$
$\Rightarrow - 3 + (0 - V_{A}) \times 1 = 1 / 2 \times 1 \times 2^{2} \Rightarrow V_{A} = - 5 J / k g$