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A ball is thrown vertically upwards with speed u from the top of a tower reaches the ground in 9 seconds.Another ball is thrown vertically downwards from the same position with same speed u takes 4 sec to reach ground. Calculate the value of u. Please please please help 🙏🙏🙏🙏
take 1st ball be b1 and another be b2.ac/eq of motionv=u+atfor b1v=0(at highest height)0=u-10×9(in case of of upward direction)u=90m/sec for b2, in this case final velocity is "u" since,v=u + gt =0+10×4 v=40m/secso,u1=90m/sec& u2=40m/sec
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