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1. At the starting gun a runner accelerates from rest at 2.0 m/s2 for 2.2 s. What is the runners speed 1.2 s after she starts running?
Question
1. At the starting gun a runner accelerates from rest at 2.0 m/s2 for 2.2 s. What is the runners speed 1.2 s after she starts running?
2. A skier starts from rest and accelerates down a slope at 2.2 m/s2 . How much time is required for the skier to reach a speed of 9.0 m/s ?
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Physics
8 months
2021-07-18T00:03:37+00:00
2021-07-18T00:03:37+00:00 1 Answers
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Answers ( )
Explanation:
1. Given:
v₀ = 0 m/s
a = 2.0 m/s²
t = 1.2 s
Find: v
v = at + v₀
v = (2.0 m/s²) (1.2 s) + 0 m/s
v = 2.4 m/s
2. Given:
v₀ = 0 m/s
v = 9.0 m/s
a = 2.2 m/s²
Find: t
v = at + v₀
9.0 m/s = (2.2 m/s²) t + 0 m/s
t ≈ 4.1 s