Question

1. A car has mass 800 kg moves with initial velocity 36km/hours. How long car moves if after travels long 150.0 m, it’s velocity becomes 72 km/hours ?.

Answer 1

males ah pen pulang gk usah sekolah

Answer 2

Vo = 36 km/h >> 10m/s
Vt = 72 km/h >> 20m/s
s 150m

(I) a = ...?
(II) t = ...?

(I)
Vt² = Vo² + 2as
(20)² = (10)² + 2a . (150)
400 = 100 + 300a
300a = 300
a = 1 m/s²

(II)
Vt = Vo + at
20 = 10 + (1) .t
t = 20 - 10 = 10s