Which one of the following statements is not true ?

Asked in UPSC CAPF 2016 · Topic: Mechanics (Newton's Laws of Motion and their applications)

1. The gravitational force of earth acting on a body of mass 1 kg is 9.8 newton
2. The force acting on an object of mass 5 kg moving with a uniform velocity of 10 m/s on a frictionless surface is zero
3. The SI unit of weight is kg
4. The momentum of a man having mass 100 kg walking with a uniform velocity of 2 m/s is 200 newton second

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