During the 1st second of uniformly accelerated movement, the body’s speed increased from 3 m / s to 5 m / s.

During the 1st second of uniformly accelerated movement, the body’s speed increased from 3 m / s to 5 m / s. What is the acceleration of the body? What will be the speed by the end of the 3rd second?

Given:
t1 = 1 sec
t2 = 3 sec
v0 = 3 m / s
v1 = 5 m / s
Find: a, v2
Decision
a = (v1-v0) / t1
a = (5 – 3 m / s) / 1 sec = 2/1 = 2 m / s ^ 2
v2 = v1 + at2
v2 = 5 m / s + 2 m / s ^ 2 x 3 sec = 11 m / s
Answer: a = 2m / s ^ 2, v2 = 11 m / s