15. Distinguish between uniform velocity and variable
velocity?
18. Give an example of motion in which average speed
is not zero, but average velocity is zero?
19. Define acceleration. State its S.I. unit.?
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15. Distinguish between uniform velocity and variable
velocity?
18. Give an example of motion in which average speed
is not zero, but average velocity is zero?
19. Define acceleration. State its S.I. unit.?
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Answer:
15. when a body covers equal distance in equal interval of timein a specific direction it is said to have uniform velocity . variable velocity: when a body covers unequal distance in equal interval of time in a specified direction , it is said to have non-uniform velocity .
18. When the object travels in a circular path, or in a path which has the initial point and final point the same ( like car race track) the average speed is not zero but average velocity is zero.
19. Acceleration is the rate of change of velocity of an object with respect to time. ... The SI unit for acceleration is metre per second squared (m s−²).
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