Tolong dong soal no. 5 ya

diket : m = 4 kg     s = 8 m     h = 4 m
ditanya : a. W     b. KM     c. F
jawab:
a. w = m x g = 4 x 10 = 10 N
    sin θ = 4/ 8 = 1/4
    W = w x sin θ x s ( karena bidang miring)
        = 40 x 1/4 x 8 = 10 x 8 = 80 J
b. KM = s/h = 8/2 = 4
c. KM = w/F
       F = w/KM = 40/4 = 10 N