An object of mass 6 kg is sliding on a frictionless horizontal surface with a uniform speed of 8 m/s. The force required to keep the object moving at the same speed along the same straight line is

The correct answer is 0 newtons.

CONCEPT:

• Newton's first law of motion: A body doesn't change its states until an external force acts on it.
• The force is the product of mass and Acceleration

Force = Mass × Acceleration

CALCULATION:

• The body is moving with a constant velocity of 8 m/s, So acceleration in the body is zero.

                             Force = Mass × Acceleration

                             Force = 6 Kg × 0

                             Force = 0 N

Mistake Point:

• Do not apply friction law as the given surface is frictionless.
• Friction law is not applicable in this case.