A. 60 km hr‾¹
B. 8 km hr‾¹
C. 40 km hr‾¹
D. 56 km hr‾¹
Correct Answer:
Option B – 8 km hr‾¹
Explanation
From momentum conservation
(800 x 80) – (1200 x 40)
= (800 + 1200) V
= 64000 – 48000 = 2000V
16000 = 2000V
V = 16000/2000
= 8kmh‾¹
The common velocity = 8kmhr‾¹
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