Question

Help pls include work plzzz

15. If an object accelerates from rest, with a constant acceleration of 5.4 m/s2, what will its velocity be after 28 s?

16. An object is traveling at a constant velocity of 15 m/s when it experiences a constant acceleration of 3.5 m/s2 for a time of 11 s. What will its velocity be after that acceleration?

17. An object is moving at a velocity of 23 m/s. It accelerates to a velocity of 85 m/s over a time of 8.3 s. What acceleration did it experience?​

Answer 1

Step-by-step explanation:

15. vt = vo + at

vo = 0 (at rest)

vt = 0 + (5.4)(28) = 151.2 m/s

16. vt = vo + at

vo = 15 m/s

vt = 15 + (3.5)(11) = 53.5 m/s

17. vt = vo + at

vo = 23 m/s

vt = 85 m/s

a?

85 = 23 + a(8.3)

85 - 23 = 8.3a

62 = 8.3a

a = 62/8.3 = 7.469 ≈ 7,5 m/s²