Question

A girl goes on morning walk with her father. She starts from a point P and reaches to point Q in one-fourth of an hour and returns to her starting point in 30 minutes. If the separation between point P and Q is 3 km, then choose the correct statement(s) regarding her entire journey. One/More Correct Answer(s) ​

Answer 1

Explanation:

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Answer 2

The correct statements regarding her journey is/ are :

1. The velocity of the first half journey is more than the second half.
2. She takes more time in completing the returning journey.
3. Total velocity is 0.

The distance between point P and Q = 3 km

                                                             = 3000 m

To reach to the point Q from point P, the time taken = 1/4 th of an hour  

                                                                                       = 15 min

                                                                                       = 15 × 60 sec

Now,

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

∴ Velocity of the first half will be = $\frac{3000}{15 ×60}$ m/s

                                                      = 10/3 m/s

Time taken to reach P from Q = 30 min

                                                 = 30 × 60 sec

∴ Velocity of the second half will be = $\frac{3000}{30 ×60}$ m/s

                                                            = 5/3 m/s

So, the velocity of the first half journey is more than the second half.

As the total displacement during the journey is 0, so, the total velocity is also 0.