Solve the following examples : A person swims 100 m in the first 40 s, 80 m in the next 40 s and 45 m in the last 20 s. What is the average speed ?

Solve the following examples: (numerical problems) A person swims 100 m in the first 40 s, 80 m in the next 40 s and 45 m in the last 20 s. What is the average speed?

Solve the following examples : An object moves 18 m in the first 3 s, 22 m in the next 3 s and 14 m in the last 3 s. What is the average speed.

Solve the following examples: (numerical problems) An object moves 18 m in the first 3 seconds, 22 m in the next 3 seconds and 14 m in the last 3 seconds. What is its average speed?

A body covers 10 m in the first 5 s and 20 m in the next 5 s. Find its average speed.

Solve the following examples / numerical problems: An object takes 5 s to reach the ground from a height of 5 m on a planet . What is the value of g on the planet ?

Solve the following example: A sound wave has wavelength 0.85 m in air and 0.9 m in a gas. The speed of sound in air is 340 m//s . Find the frequency of sound and the speed of sound in the gas.

Solve the following example: A person standing before a cliff shouts and hears the echo afte 1.6 s. Find the distance between the person and the cliff. (speed of sound in air= 340 m//s )

Solve the following example: A sound wave has wavelength 0.86 m and speed 344 m//s in air. If its wavelength in a gas in 0.8 m, Find the speed of sound of sound in the gas.

Solve the following example: A person standing between two hills fired a gun and heard the first echo after 0.5 s and the second echo after 0.9 s. Find the distance between two hills. (speed of sound in air =340 m//s )

Solve the following examples/ numerical problems:(c=3xx10^8 m/s) The velocity of light in a medium is 2xx10^8 m/s. What is the refractive index of the medium with respect to air, if the velocity of light in air is 3xx10^8 m/s ?