Question

4. Identify the following as scalar or vector quantities:- mass, velocity, speed, length, distance,
displacement, temperature, force, weight, power, work and energy.
5. The school of a boy from his home is 1 km to the east. When he reaches back home, he says
that he had traveled 2 km distance but his displacement is zero. Justify your answer.

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 (a) km/min (b)
m/s (c) m/min (d) km/hr.
10. a train is moving with a velocity of 45km/hr. 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. When do you say that an object has positive acceleration?
(11) 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.
(b) A body moving horizontally with acceleration in vertical direction.
(c) A body moving with a constant speed in an accelerated motion.​

Answer 1

Answer:

speed -scalar, velocity- vector