Answer:
The runner´s speed is 2.2 m/s after 1.3 s.
Explanation:
The acceleration is the variation of velocity over time. If the acceleration is constant, then:
dv/dt = a
Separating variables:
dv = a · dt
integrating from initial velocity (v0) to v and from t = 0 to t:
v - v0 = a · t
v = v0 + a · t
Then usign this equation, we can calcualte the speed at t = 1.3 s:
v = 0 m/s + 1.7 m/s² · 1.3 s
v = 2.2 m/s
The runner´s speed is 2.2 m/s after 1.3 s.
