Question

7. Can the average speed of a moving body be zero?
8. Can the average velocity of a moving body be zero? State eamples.
9. A car covers a distance of 5 km in 20 mins. Find the velocity of the car in (@) km/min (6)
m/s (c) m/min (d) km/hr.
10. a train is moving with a velocity of 45km/br. calculate the distance traveled by it in 1 hr, 1
min, 1 second.
11. An object P is moving with a constant velocity for 5 mins. Another object Q is moving with
changing velocity for 5 mins. Out of these two objects, which one has acceleration? Explain.
12. Can an object be accelerated if it is moving with constant speed? If yes, explain giving
examples.
13. (1) When do you say that an object has positive acceleration?
(i) When do you say that an object has negative acceleration?
14. State which of the following situations are possible and give an example of each of these:-
(a) a body moving with constant acceleration but with zero velocity.
(6) A body moving horizontally with acceleration in vertical direction.
(c) A body moving with a constant speed in an accelerated motion.
15. What is a reference point?
16. Name the 2 physical quantities which can be obtained from velocity-time graph.
17. An electric train is moving with a velocity of 120km/hr. how much distance will it cover in
30 sec?
18. Give differences between linear motion and circular motion.
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Answer 1

Answer:

1)Yes, if distance can be zero then speed can also be zero.because speed is equals to distance (0) divided by time(x). so, 0/ x =0. Average speed for a moving body will never be zero. As DISTANCE is the path travelled by an object, so DISTANCE cannot be zero.

2)Yes, average velocity of a moving body can be zero. Average velocity is displacement by time. So for example, if you are travelling in a circle, and come back to your initial point, displacement is zero.

3)

Answer 2

Answer:

1)Yes, if distance can be zero then speed can also be zero.because speed is equals to distance (0) divided by time(x). so, 0/ x =0. Average speed for a moving body will never be zero. As DISTANCE is the path travelled by an object, so DISTANCE cannot be zero.

2)Yes, average velocity of a moving body can be zero. Average velocity is displacement by time. So for example, if you are travelling in a circle, and come back to your initial point, displacement is zero.

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