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D1 t = 5 s
F = 40 N
m = 10 kg
D2 v...?
D3.
Rumus
a = F / m
= 40 N / 10 kg
= 4 m/s^2
s = vo.t + 1/2 at^2
= 0 . 5 + 1/2 . 4 . 5^2
= 0 + 50
= 50 m
w = F . s
= 40 . 50
= 2000 j
W = Ek = 1/2 mv^2
2000 = 1/2 . 10 . v^2
v^2 = √(2000 / 5)
= √400
v = 20 m/s
Jadi, Kecepatannya 20 m/s