A bird flies at 10ms−1 for 3s, 15ms−1 for 3...
A bird flies at 10ms−1 for 3s, 15ms−1 for 3s and 20 ms−1 for 4s. Calculate the bird's average speed
4.5 ms-1
15.0 ms-1
15.5 ms-1
51.7 ms-1
Correct answer is C
Av. speed = 3×15+3×10+4×203+3+4
= 15.5 ms−1