Question

which of the following does not illustrate uniform motion?

1. A boy runs 80m along a straight track at constant speed.

2.A stone is thrown upwards with a speed of 10 ms^-1

3.A ball moves along a frictionless surface without any external force.

4. An aeroplane flying with constant speed of 250 ms^-1 at an altitude of 1000m along north ​

Answer 1

Answer:

3 rd op

Explanation:

Answer 2

"A stone is thrown upwards with a speed of 10 m/s" doesn't illustrate uniform motion. hence, (2) is correct option.

which of the following does not illustrate uniform motion ?

1. A boy runs 80m along a straight track at constant speed.
2. A stone is thrown upwards with a speed of 10 m/s.
3. A ball moves along a frictionless surface without any external force.
4. An aeroplane flying with constant speed of 250 m/s at an altitude of 1000m along north.

Uniform motion :

• It is defined as the motion of an object travels in a straight line with constant speed .
• There is no any acceleration acting on the object in uniform motion.

Let's check the options.

• Option 1 : It is a uniform motion because boy runs along a straight track with constant speed.
• Option 2 : It is non - uniform motion because gravitational force pulls the stone towards its centre. it means, it is accelerating motion hence the speed of stone can't be constant.
• Option 3 : It is uniform motion, because the ball moves along a frictionless surface without any external force. so the speed of ball remains the same and there is no change in direction.
• Option 4 : It is uniform motion as it is mentioned that the speed of the aeroplane is constant.

Therefore the correct option is (2).

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