Question

21. A girl walks a distance of 2 km in 40
minute. Find her speed.
(Answer: 0.83 m s-)
22. If the girl in Q 21 walk back and covers the
same distance in 50 minute. What is the
average speed of the girl.
(Answer: 0.74 ms)​

Answer 1

Answer:

22.. 222002×2223 =0.74 ms

Answer 2

QUESTION 1

A girl walks a distance of 2 km in 40minute. Find her speed.

SOLUTION

TO FIND:-

• SPEED OF GIRL

GIVEN

• DISTANCE = 2km

=> 2 × 1000

=> 2000m

• Time = 40 minutes

=> 40 × 60

=> 2400 sec

FORMULA

$SPEED = \frac{DISTANCE}{TIME}$

ACCORDING TO QUESTION

$Speed =\frac{DISTANCE}{TIME}$

$Speed =\frac{2000m}{2400sec}$

$Speed =\frac{5m}{6sec}$

$Speed = 0.83m/s$

THEREFORE

SPEED OF GIRL = 0.83m/s

QUESTION 2

If the girl in Q 21 walk back and covers the same distance in 50 minute. What is the average speed of the girl?

SOLUTION

TO FIND

• AVERAGE SPEED OF THE GIRL

GIVEN

• DISTANCE = 2000m
• TIME = 50m

=> 50 × 60

=> 3000

FORMULA

$Average\:Speed=\frac{Total\:Distance\:Travelled}{Total\:Time\:Taken}$

NOW

TOTAL DISTANCE TRAVELLED = 2000 + 2000

=> 4000m

TOTAL TIME TAKEN = 2400 + 3000

=> 5400sec

ACCORDING TO QUESTION

$Average\:Speed=\frac{Total\:Distance\:Travelled}{Total\:Time\:Taken}$

$Average\:speed=\frac{4000m}{5400sec}$

$Average\:speed=\frac{20m}{27sec}$

$Average\:speed=0.74m/sec$

THEREFORE

AVERAGE SPEED OF GIRL = 0.74m/s