High School

A bird flies at [tex]10 \, \text{m} \, \text{s}^{-1}[/tex] for 3 seconds, [tex]15 \, \text{m} \, \text{s}^{-1}[/tex] for 3 seconds, and [tex]20 \, \text{m} \, \text{s}^{-1}[/tex] for 4 seconds. Calculate the bird's average speed.

A. [tex]4.5 \, \text{m} \, \text{s}^{-1}[/tex]
B. [tex]15 \, \text{m} \, \text{s}^{-1}[/tex]
C. [tex]15.5 \, \text{m} \, \text{s}^{-1}[/tex]
D. [tex]51.7 \, \text{m} \, \text{s}^{-1}[/tex]

Answer :

The bird's average speed when he flies 10 m/s for 3 s, 15 m/s for 3s and 20 m/s for 4 s is 15.5 m/s. The right option is C 15.5 m/s

What is average speed?

Average speed can be defined as the ratio of the total distance to the total time traveled by an object.

To calculate the average speed of the bird, we use the formula below.

Formula:

  • S = Total distance/total time
  • S = s₁t₁+s₂t₂+s₃t₃/(t₁+t₂+t₃)............. Equation 1

From the question,

Givne:

  • s₁ = 10 m/s
  • t₁ = 3 s
  • s₂ = 15 m/s
  • t₂ = 3 s
  • s₃ = 20 m/s
  • t₃ = 4 s

Substitute these values into equation 1

  • S = [(10×3)+(15×3)+(20×4)]/(3+3+4)
  • S = (30+45+80)/10
  • S = 155/10
  • S = 15.5 m/s

Hence, the average velocity of the bird is 15.5 m/s.

Learn more about average velocity here: https://brainly.com/question/24739297

#SPJ1

Other Questions