Question

A toy helicopter begins flying across a field with a speed of 2 m/s and an

acceleration of 0.2 m/s2. How long does it take the helicopter to reach a
speed of 8 m/s?

A. 10 s
B. 5s
C. 30 s
D. 50 s

Answer 1

C. 30 s

Step-by-step explanation:

Given:

v₀ = 2 m/s

v = 8 m/s

a = 0.2 m/s²

Find: t

v = at + v₀

(8 m/s) = (0.2 m/s²) t + (2 m/s)

t = 30 s