can you solve my problem
Answers
4. True
Displacement/time = Velocity
If displacement = 0, then velocity itself becomes 0.
5. True
1 m/s = 1 m/s
1 km/h = 1 * 5/18 m/s = 5/18 m/s
We know, 5/18 > 1.
6. True
7. True
As body's mass is constant, and g is always 9.8 m/s^2. So, the force acting on it doesn't change.
8. False
If the velocity of a vehicle decreases, then acceleration also decreases. If v < u, then acceleration is negative.
9. True
Motion is a relative term. It means that if we change the fixed reference points for an object, it may be at motion from one point and at rest from the other.
10. True
Average velocity = (Initial velocity + Final velocity)/2
11. True
In a market place, due to crowd the bike cant move with a constant speed. Hence, it cant cover equal distance in specific time intervals. Thus, it is a non-uniform motion.
12. True
13. False
Odometer calculates the distance travelled by the vehicle.
14. False
For uniform motion, the path has to be straight. If its a curved path, the velocity varies.
15. False
Speedometer measures the instantaneous speed of the vehicle, not the magnitude of velocity.
16. True
If a body is moving with uniform velocity means the speed and direction both are uniform means it is same or not changing. Thus for a body moving with uniform velocity will have zero acceleration.
17. True
If speed decreases, acceleration also decreases. For deceleration, velocity and acceleration move in opposite directions.
18. True
The direction of the velocity vector is directed in the same direction that the object moves.
19. False
Whether the object is at rest or moving at constant velocity, the acceleration at that point in time is 0. If velocity is 0, acceleration therefore becomes 0.
20. False
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