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U1= 100
S1= 100 + 300/4 + 900/16 + ...
U2= 100 x 3/4 = 75
S2= 75 + 225/4 + 675/16 + ....
Panjang lintasan = pjg lintasan bola jth ke bwh + pjg lintasan bola jatuhke atas
= S∞1 + S∞2
= 100 + 75
1-3/4 1-3/4
= 400 + 300
= 700 cm
= 7m