1. A person of mass 50 kg flies to the moon. Given that the earth's gravity is 10 $ms^{-2}$ and the moon's gravity is 1.6 $ms^{-2}$, his weight on the moon would be

2. Newton's first law is also known as

3. As the speed decreases, if we change the medium of electromagnetic waves from air to water, the frequency

4. The electromagnetic spectrum comprises

5. Electromagnetic waves obey the law of

6. The formula for the gravitational potential energy is

7. A bus travels with a constant force of 5000 N and the work done by the bus is 2500 J. The distance traveled by the bus is

8. An object is lifted 5 m above the leveled ground, the mass of the object is 20 kg, and the gravitational pull is 10 $Nkg^{-2}$, the gravitational potential energy ($E_{p}$) of the object is

9. The SI unit for work done is

10. In order to do work, energy is