Question

(d) The rate of doing work is called
(e) A human ear consists of
parts.
2. Write True or False for the following statements : (1x5 = 5)
(a) The distance covered per unit area is called speed.
(b) To every action there is an equal and opposite reaction.
(c) Pressure is inversely proportional to the force applied on a surface.
(d) Kinetic energy is the energy possessed by virtue of its motion.
(e) Wave velocity is the velocity at which a sound travels through a medium.
3. Answer the following questions in short: (2x5 = 10)
(a) When a body is said to be at rest?
(b) State Newton's second law of motion ?
(c) What do you mean by force of gravity ?
(d) State the 'law of Conservation of Energy'.
(e) Why are the sound waves known as mechanical waves ?​

Answer 1

Answer:

sorry I dont know this

Explanation:

Because I am only 9 th standard so I don't know