A racing car has a uniform acceleration of 4 m s–2. What distance will it cover in 10 s after start?

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Chapter 7 NCERT Class 9 Science SOLUTIONS

4. A racing car has a uniform acceleration of 4 m s–2. What distance will it cover in 10 s after start?

Question:

A racing car has a uniform acceleration of 4 m s–2. What distance will it cover in 10 s after start?

Answer:

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(All Q's of this Chapter solved)

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An artificial stellite is moving in a circular obrit of radius 42250 km. Calculate it's speed if it takes 24 hour to revolve around the earth.

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Joseph jogs from one end A to the other end B of a straight 300 m road in 2 minutes 30 seconds and then turns around and jogs 100 m back to point C in another 1 minute what are joseph's average speed and velocities in jogging (a) from A to B and (b) from A to C.

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A stone is thrown in a vertically upward direction with a velocity of 5 ms–1. If the acceleration of the stone during its motion is 10 ms–2 in the downward direction, what will be the height attained by the stone and how much time will it take to reach there?

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A racing car has a uniform acceleration of 4 m s–2. What distance will it cover in 10 s after start?

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A train is moving with a speed of 90 km/h. When brakes are applied, a retardation of 0.5 m/s2 is produced. How much distance will the train cover before it stops and how long will it take?

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What is the quantity which is measured by the area occupied below the velocitytime graph?

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What can you say about the motion of an object if its speed time graph is a straight line parallel to the time axis?

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What is the nature of the distance-time graphs for uniform and non-uniform motion of an object?

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A train starting from a railway station and moving with uniform acceleration attains a speed of 40 km h–1 in 10 minutes. Find its acceleration.

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A bus decreases its speed from 80 km h–1 to 60 km h–1 in 5 s. Find the acceleration of the bus.

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What does the path of an object look like when it is in uniform motion?

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Under what condition(s) is the magnitude of average velocity of an object equal to its average speed?

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Distinguish between speed and velocity.

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A farmer moves along the boundary of a square field of side 10 m in 40 s. What will be the magnitude of displacement of the farmer at the end of 2 minutes 20 seconds from his initial position?

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An object has moved through a distance. Can it have zero displacement? If yes, support your answer with an example.

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