A) 50
B) 40
C) 30
D) 20
Correct Answer: B
Solution :
The situation is shown in the figure. In the upward journey, the body is at A at \[t=1\] s and in downward journey it is at A at \[t=7\] s. Hence, we can conclude that during upward journey, the body will be at 6 at \[t=4\] s. Thus, \[v=v-gt\] \[0=u-10\times 4\] \[(\because \,\,v=0)\] \[\therefore \] \[u=40\,m{{s}^{-1}}\]You need to login to perform this action.
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