If the mass of block B is 2kg, the gravitational force exerted on block B is most nearly which of the following? 0.2N
2N
20N

P.S The acceleration is 10m/s^2 but I have no idea how to get that, so could someone explain that to me.

Gravitational force exerted on block B is 20 N

Given that;

Mass of block = 2 kg

Acceleration = 10 m/s²

Find:

Gravitational force exerted on block B

Computation:

Gravitational force = ma

Gravitational force exerted on block B = Mass of block × Acceleration

Gravitational force exerted on block B = 2 × 10

Gravitational force exerted on block B = 20 N

Learn more:

link

20 N.

Explanation:

The following data were obtained from the question:

Mass of block B (m) = 2 Kg

Acceleration due to gravity (g) = 10 m/s²

Gravitational force (F) =..?

Force is simply defined as the product of mass and acceleration i.e

Force = mass (m) × acceleration (a)

F = ma

Thus, we can say that the gravitational force on block B will be the product of the mass of block B and acceleration due to gravity i.e

Gravitational force (F) = mass of block B (m) × acceleration due to gravity (g)

F = mg

Mass of block B (m) = 2 Kg

Acceleration due to gravity (g) = 10 m/s²

Gravitational force (F) =..?

F = mg

F = 2 × 10

F = 20 N

The, the gravitational force exerted on block B is 20 N

You did 500 Nm work on the box.

Explanation:

Work = Force applied x Distance

For an object to tend to move, the force applied must be equal or greater than the weight and coefficient of friction. Considering that the surface is smooth, therefore, the coefficient of friction is negligible.

Force Applied = 100 N

Distance = 5 m

∴ Work = 100 N * 5 m

            = 500 Nm