Question

V0 = 30 m/s jarak 100 m dengan kecepatan akhir 120 m/s. Berapa percepatannya ?

Answer 1

Diketahui :
vo = 30 m/s
vt = 120 m/s
s = 100 m

Ditanyakan :
a = ?

Jawab:
vt = vo + at
120 = 30 + at
90 = at

s = vo t + 1/2 at x t
100 = 30t + 1/2 (90) t
100 = 30t+45t
100 = 75 t
t = 100/75 s

at = 90
a (100/75) = 90
a = 90x75/100 = 67,5 m/s²

Answer 2

Vt² = Vo² + 2as
masukkan nilai masing-masing :
(120m/s)² = (30 m/s)² + 2a(100m)
14400 m²/s² = 900 m²/s² + 200am
14400 m²/s²  -  900 m²/s²  =  200am
13500 m²/s² = 200am
a = 13500 m²/s² : 200m
a = 67,5 m/s²