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jadi pertama cari dulu W-nya
W = F×s
= 40 × 10 = 400
terus cari pakek rumus Ek
Ek = 1/2 × m × v² >[ Ek = W ]
400 = 1/2 × 100 × v²
400×2 = 1 × 100 × v²
800 = 100 × v²
800/100 = v²
v² = 8
v = √8
v = √4 × 2
v = 2√2
jadi, kecepatan benda tersebut 2√2 m/s (C)
kalau gk salah ..
bandingin lagi sama yg lain ya
semoga bermanfaat