Question

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Answer 1

Answer:

we know, speed=dist./time

therefore,

speed= (d1+d2)/(s1+s2)

=(10+20)/(5+15)

=30/20

=1.5 m/s

Answer 2

${\large{\pmb{\underline{\sf{RequirEd \: solution...}}}}}$

${\bigstar \:{\pmb{\underline{\sf{About \: Question...}}}}}$

⋆ Question: A car travels 10 m in 5 seconds, 20 m in next 10 seconds and 30 m in the last 10 seconds. Find the average speed of the motion.

⋆ Understanding the question: This question says that we have to find out the average speed of a car's motion, car is travelling. Firstly the car travels at 10 metres in 5 seconds then it travel 20 metres in 10 seconds and at last in again 10 seconds it travel 30 metres.

${\bigstar \:{\pmb{\underline{\sf{Provided \: that...}}}}}$

⋆ A car travels 10 m in 5 seconds

⋆ Then it travels 20 m in next 10 seconds

⋆ It travels 30 m in the last 10 seconds

${\bigstar \:{\pmb{\underline{\sf{To \: find...}}}}}$

⋆ Average speed of the motion

${\bigstar \:{\pmb{\underline{\sf{Solution...}}}}}$

⋆ Average speed of the motion = 2.8 m/s

${\bigstar \:{\pmb{\underline{\sf{How \: to \: solve \: this \: question...}}}}}$

⋆ Procedure: To solve this question we have to firstly add the distance together then we have to add the time together. Afterwards we have to use formula to find average speed and henceforth, we will get our final result.

${\bigstar \:{\pmb{\underline{\sf{Using \: concept...}}}}}$

⋆ Formula to find out average speed. Average speed is given by

${\underline{\boxed{\sf{\pink{Average \: speed \: = \dfrac{Total \: distance}{Total \: time}}}}}}$

• If an object travels a distance s in time t then it's speed v is

${\underline{\boxed{\sf{\pink{v \: = \dfrac{s}{t}}}}}}$

${\bigstar \:{\pmb{\underline{\sf{Full \; Solution...}}}}}$

~ Finding total distance first.

»»» Total distance = First interval + Second interval + Third interval

»»» Total distance = 10 + 20 + 30

»»» Total distance = 30 + 30

»»» Total distance = 60 metres

~ Now finding total time.

»»» Total time = First interval + Second interval + Third interval

»»» Total time = 5 + 10 + 10

»»» Total time = 15 + 10

»»» Total time = 25 seconds

~ Now finding average speed.

»»» v = s/t

»»» v = 60/25

»»» v = 14/5

»»» v = 2.8 m/s

»»» Average speed of the motion is 2.8 metre per second