Page 55 - Momentum dan impuls modul
P. 55
′
′
Dit: ?
Jawab :
• Berlaku hukum kekekalan momentum
∑ = ∑
′
′
+ = +
′
′
′
+ = +
10 4
′
′
20 . + 40 ൬− ൰ = 20 . + 40 .
40
= 20 + 40
′
′
2
′
′
= + 2 . . . . (1)
• Karena tumbukan lenting sempurna memiliki nilai koefisien
restitusi = 1
∆ ′
= −
∆
∆ ′
1 = −
∆
′
∆ = −∆
′
− = −( − )
′
4 10
′
′
− − = −( − )
14
′
= − … . (2)
′
• Eliminasi persamaan (1) dan (2)
45
