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Vo= 100m/s
persamaan a= 4-2t
ditanya = kec. stelah 4 s?
jawab
Vt-Vo = integral a.dt
Vt= Vo + integral a.dt
= 100 + intgrl (4-2t) dt
= 100 + 4t - t²
4 s= 100 + 4.4 + 4²
= 100+16+16
= 132 m/s
maka kecepatan stelah brgerak 4 s
adalah vt-vo = 132-100
= 32 m/s
maaf kalo ada yg salah.