tolong bantu ya karena soalnya sulit

21. dik: F = 250 N ; s = 1000 cm /100 = 10 m
dit: W
jawab : W = F × s
W = 250 N × 10 m = 2500 Joule (C)

22. dik: m bus = 10.000 kg ; m mobil = 500 kg
v bus = 10 m/s ; v mobil = 20 m/s
dit : perbandingan Ek
jawab:
Ek = 1/2 × m × v²
* Ek bus = 1/2 × 10.000 × (10²)
= 1/2 × 10.000 × 100
= 500.000 Joule

*Ek mobil = 1/2 × 500 × (20²)
= 1/2 × 500 × 400
= 100.000 Joule

Perbandingan Ek bus dan Ek mobil =
500.000 : 100.000 = 5:1