Question

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Answer 1

Answer:

1. linear or uniform motion

2. the body is not moving,but time will move.

3. non-uniform.

4. 22.5 m/s.

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Answer 2

$\underline{\underline{\pink{\huge\sf Answer}}}$

Question 1

1) From A to B we see that the slope of the graph gives us a straight line and if it is a straight line then as per our definition "When a body travels equal distances in equal interval then it is said to be in Uniform Motion". And so the body has a uniform speed from A to B.

2) During A to B the body has travelled 5 units but take a look at B to C the distance travelled has not increased,i.e

➝ $\sf Speed = \dfrac{Distance}{Time}$

➝ $\sf Speed = \dfrac{0}{3}$

➝ $\sf \green{Speed = 0}$

$\sf \therefore$ Body is in rest

3) We know that,

»» Uniform Motion = Equal Distances in unequal time [Distance/Time = straight line]

»» Non Uniform Motion = Unequal Distance in equal intervals of time [Distance/Time = Not a straight line]

So here A to B is Uniform, B to C is uniform (0) and C to D is uniform but A to B ≠ B to C ≠ C to A and so A to D represents Non Uniform Motion

4) Average Speed is given by,

$\sf \underline{\boxed{\sf Avg \ speed = \dfrac{Total \ Distance}{Total \ Time}}}$

• Total Distance = 7 cm
• Time = 9 sec

Substituting the values,

➳ $\sf Avg \ Speed = \dfrac{Total \ Distance}{Total \ Time}$

➳ $\sf Avg \ Speed = \dfrac{7}{9}$

➳ $\sf \red{Avg \ Speed = 0.78 \ cm/s}$

Question 2

So here we may see that the distance travelled by the body is equal in equal intervals so it will be a uniform motion,in a uniform motion the D/T graph will be a straight line.

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