Test: Acceleration Due to Gravity - NEET MCQ

Correct option is B.

We know that g∝M_p​, Where M_p​ is mass of planet. 

So,  g_p​=5×10=50 m/s²

So work done in lifting a 3 kg stone by 1m =50×3×1=150J

There's no such thing as zero gravity. Weightlessness and zero gravity are two different things. The earth's gravity keeps the moon in orbit. And astronauts are generally much closer to earth than the moon is, which means that the earth's pull on them has to be much stronger.

The value of acceleration due to gravity on earth is g=9.8ms⁻².

Hence,

option A is correct answer.

The acceleration due to gravity does not vary with the change in the mass of the object as it is a dimensionless quantity representing the amount of matter in a particle or object.
Therefore, the acceleration of a 5 kg mass at the same place is 7m/s².

A ball is thrown vertically upwards. The acceleration due to gravity is in the downward direction.

Given that,

Radius of planet A is twice that of planet B and the density of A is one-third that of B.

so, the radius is

The ratio of the acceleration due to gravity at the surface of A to that at the surface of B is

Acceleration due to gravity is given by the equation g = GM/R² (at surface)

so g₁ = GM₁ /R₁² and g₂ = GM₂ /R₂² (gravities at planets 1 and 2)

also M₁/M₂ = V₁p₁/V₂p₂ = R₁³ p₁/ R₂³ p₂ (as V = 4/3 π r³

Therefore, g₁/g₂ = R₁ ρ₁ / R₂ ρ₂ = (4/1) x (1/2) = 2:1