A) 90 N
B) 180 N
C) 360 N
D) 720 N
E) 810 N
Correct Answer: B
Solution :
\[v=108\times \frac{5}{18}m\text{/}s\] \[=30\,m\text{/}s\] Momentum = 120 x 30 kg-m/s (initial) Final momentum = 0 \[\text{Force}=\frac{\text{change}\,\text{in}\,\text{momentum}}{\text{time}}\] \[=\frac{120\times 30}{20}=180\,N\]You need to login to perform this action.
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