Question

SI units in motion ch-8 physics class 9

Answer 1

Answer:

1. unit of velocity is m/s

2. unit acceleration is m/s2

3. unit of displacement is meter

5. unit of average speed is m/s

Explanation:

Answer 2

Answer:

SI Unit of Distance ⇒ m (meter)

SI Unit of Displacement ⇒ m (meter)

SI Unit of Time ⇒ s (second)

SI Unit of Speed ⇒ m/s or ms⁻¹

SI Unit of Velocity ⇒ m/s or ms⁻¹

SI Unit of Acceleration ⇒ m/s² or ms⁻²

Explanation:

i) Distance: Distance is the length covered by an object from the initial point to the final point of motion. It has only magnitude making it a scalar quantity.

ii) Displacement: Displacement is the shortest path from the initial point to the final point of motion. It has both magnitude and direction making it a vector quantity.

iii) Time: Time is the amount of time taken to cover a distance.

iv) Speed: The speed of an object is the distance covered by the object per unit of time.

$Speed = \frac{Distance \ covered}{Time \ taken}$

v) Velocity: The velocity of an object is the displacement per unit of time.

$Velocity = \frac{Displacement}{Time \ taken}$

vi) Acceleration: The acceleration of an object is the change in velocity per unit time.

$Acceleration = \frac{Change \ in \ velocity}{Time \ taken}$

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