Which of the following deductions is/are true from Newton's first law of motion?

1) The velocity of a body, in the absence of a resultant force, is always zero.

2) A body is always reluctant to change its state of motion.

3) A resultant force is NOT necessary to produce a change in velocity.

Which of the following is correct?

The acceleration due to gravity on earth is 10 ms⁻² while on the moon it is 1.6 ms⁻².

If a person whose weight on earth is 500 N goes to the moon.

His weight on the moon will be:

A car travelling at 60 km per hour passes a truck going at 30 km per hour that has four times the mass of the car.

Which of the following is true?

1) The car and the truck have the same momentum and the same kinetic energy.

2) The truck has greater kinetic energy than the car.

3) The car has the same kinetic energy and half as much momentum as the truck.

A body falling in air experiences terminal velocity when its: