a bird flies at 10ms-1 for 3s 15ms-1 for 3s and... - WAEC Physics 2012 Question
a bird flies at 10ms-1 for 3s, 15ms-1 for 3s and 20 ms-1 for 4s. Calculate the bird's average speed
A
4.5 ms-1
B
15.0 ms-1
C
15.5 ms-1
D
51.7 ms-1
correct option: c
A.V. speed = \(\frac{3 \times 15 + 3 \times 20 + 4 \times 20}{3 + 3 + 4}\)
= 15.5 ms-1
= 15.5 ms-1
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