Question

Q.3) Answer the following questions.

1) Explain positive, negative and zero acceleration
2)What is uniform circular motion? State the formula for the magnitude of velocity of a particle performing uniform circular motion.
3) Explain the term momentum. Write the equation for it according to newton’s second law.
4) A stone having a mass of 250gm is falling from a height. How much kinetic energy does it have at the moment when is 2m/s?
5) Write down the expression for potential energy.
6) Define-ohm’s law. Write the expression for it and formula.
7) Expression for resistors in parallel.

CLASS 9TH
GIVE ME CORRECT ANSWERS I WILL MARK AS BRAINLIEST ANSWER.
​

Answer 1

Answer:

1. when velocity of an object increases then the acceleration is called as positive acceleration.

when velocity of an object decreases then the acceleration is called as negative acceleration.

when velocity of an object does not change with time then the acceleration is called as zero acceleration.