CAN U PLZ ANSR THIS QSTN AND IRRELEVANT ANSRS WILL B REPORTED.......I WANT BOTH NUMERICALS TO B SOLVED.....WITH PROPER STEP BY STEP EXPLAINATION.....
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Hiii shivi ????????
(1) h=21×10×(20)2=5×400=2000m
Now, t1= time of falling =20sec
t2= time taken by sound
=VsonicH=3302000=6.06s
∴ Time after dropping the pebble at which echo is heard =26.06sec
(2) ANSWER
s=ut+21at2
=19.6×5−21×9.8×52
=−24.5 m
Hence, height of tower =24.5m
v=u+at
=19.6−9.8×5=−29.4 m/s
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