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What is speed?...

What is speed?

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What is supersonioc speed?

A cathod ray is operated 2500 V. What is the speed of elelctron?

The escape speed of a projectile on the earth’s surface is 11.2 km s^-1 A body is projected out with thrice this speed. What is the speed of the body far away from the earth? Ignore the presence of the sun and other planets.

A jet airplane travelling at the speed of 500 km h-1 ejects its products of combustion at the speed of 1500 km h-1 relative to the jet plane. What is the speed of the latter with respect to an observer on ground?

Two cars are moving in the same direction with the same speed ( = 30km/hr ). They are separated by a distance of 5 km. What is the speed of a car moving in the opposite direction if it met these cars at an interval of 4 minutes?

Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 × 108 m/s .

The frequency of horn of a car drops by 10% as the car passes a stationary observer.What is the speed of the car?[velocity of sound = 330 m/s]

What is the speed of light in glass of refractive index 1.5 if the velocity of light in the free space is 3 x 10^8 ms^-1 ?