Heya!!
For calculate aceleration, lets applicate formula:
[tex]\boxed{a=\frac{V-V_o}{t} }[/tex]
Δ Being Δ
V = Final Velocity = 21 m/s
Vo = Initial Velocity = 0 m/s
a = Aceleration = ? m/s²
t = Time = 3,9 s
⇒ Let's replace according the formula:
[tex]\boxed{a=\frac{21\ m/s - 0 \ m/s}{3,9\ s} }[/tex]
⇒ Resolving
[tex]\boxed{ a=5,38\ m/s^{2}}[/tex]
Result:
The aceleration of the object is 5,38 m/s²
Good Luck!!
