Question

help me in solving this question

Answer 1

s = ut + 1 at²
441 = 0 + ½(9.8)t²
By solving we get t = 9.5 s
For other stone t = 9.5 - 1 = 8.5 s
s = ut + ½ at²
441 = 8.5u + ½ ( 9.8 ) ( 8.5 )²
on solving we get u = 12.2 m/s