Question

A bird flies towards east at 10 m/s for 100 m. It then turns around and flies at 20 m/s for 15 s. Find (a) Its average speed (b) Its average velocity​

Answer 1

Answer:

velocity = 8m/s west

Explanation:

100m = 100/10 = 10s

displacement in east = 100

distance travelled towards west = 20*15 = 300m

Net displacement = 100 i + 300 (-i) = -200 i

Average velocity = change in speed / Total time = $\frac{200}{10+15}$=8

Answer 2

Answer:

a)16 m/s

b)8 m/s

Explanation

     total distanced = 100m+ 20 x 15

                                  = 100m+300m

                                   =400m

    a)    average speed= total distance/total time taken

                                  = 400/25

                                  = 16m/s

      b)   average velocity =  displacement/time taken

                                           = 200/25

                                            = 8 m/s