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F = 50 N
θ = 37°
t = 20 detik
ditanya : W = .... ?
dijawab : W = F s cos θ
mencari percepatan benda :
a = F cos θ /m
= 50 cos (37°) / 10
= 5 x (4/5)
a = 4 m/s²
Mencari jarak benda :
s = 1/2 at²
= 1/2 . 4 . 20²
= 2 . 400
s = 800 m
Mencari Usaha :
W = F s cos θ
= 50 . 800 cos (37°)
= 40000 (4/5)
W = 32000 joule
Jawaban : C