Speed of rock before impact is 50 m/s
Given that;
Time taken by rock from bridge = 5 seconds
Find:
Speed of rock before impact
Computation:
Initial velocity = 0 m/s
Using first equation of motion
v = u + gt
v = 0 + (10)(5)
v = (10)(5)
v = 50 m/s
Final velocity = 50 m/s
Speed of rock before impact = 50 m/s
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Answer:
(a) 896
(b) 1000
(c) 910
Step-by-step explanation:
Number of women = 8
Number of men = 6
A committee consisting of 3 men and 3 women is to be formed.
(a) 2 of the men refuse to serve together.
Number of men who don't want to serve together = 2
Remaining men = 4
Total ways = Both men who don't want to serve together are not selected + only one of them is selected.
(b) 2 of the women refuse to serve together.
Number of women who don't want to serve together = 2
Remaining men = 6
Total ways = Both women who don't want to serve together are not selected + only one of them is selected.
(c)1 man and 1 woman refuse to serve together.
Ways = Total ways - Both man and woman are select who refuse the serve together