Question

a car travels 10 m in 5seconds and another 20m in 10s .find average speed of a car

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Answer 1

Answer:

Given –

• Distance travelled 1 = 10 m.
• Time taken 1 = 5 seconds.
• Distance travelled 2 = 20 m.
• Time taken 2 = 10 seconds.

To Find –

• Average speed ?

Solution –

Average Speed = Total Distance travelled/Total time taken

➸ Avg. Speed = (D1 + D2)/(T1 + T2)

➸ Avg. Speed = (10 + 20)/(5 + 10)

➸ Avg. Speed = 30/15

➸ Avg. Speed = 2/1

Average speed = 2 m/s

Some important terms to know –

• Distance is the total path travelled by a body.
• Displacement is the shortest distance between the initial position of the body and the final position of the body.
• Speed is the rate of change of distance.
• Velocity is the rate of change of displacement.
• Acceleration is the rate of change of velocity.
• Average speed of an object is total distance travelled by the object in total time.
• Average velocity is said to be the total displacement of the body in total time.
• Distance and speed are said to be scalar quantities.
• Displacement and velocity are said to be vector quantities.

Answer 2

Answer:

Explanation:

Given :-

Distance covered, D₁ = 10 m

Time taken, T₁ = 5 seconds

Distance covered, D₂ = 20 m

Time taken, T₂ = 10 seconds

To Find :-

Average Speed

Formula to be used :-

Average Speed = Total Distance covered/Total time taken

Solution :-

Putting all the values, we get

Average Speed = Total Distance covered/Total time taken

⇒ Average Speed = (D₁ + D₂)/(T₁ + T₂)

⇒ Average Speed = (10 + 20)/(5 + 10)

⇒ Average Speed = 30/15

⇒ Average Speed = 2/1

⇒ Average speed = 2 m/s

Hence, the average speed of a car   2 m/s.