1 Having seen a big stone falling from the top of a tower Ravi pulled his friend Kiran away - Physics - Motion In A Straight Line

Question

1 Having seen a big stone falling from the top of a tower Ravi
pulled his friend Kiran away The stone hit Ravi slightly and he got
hurt But he was saved from a major accident (a)What made Ravi act
in such a way (b)From the top of a tower 100 m in height, a ball is
dropped and at the same time another ball is projected vertically
upwards from the ground with a velocity of 25 m/s Find when and
where the two balls meet Take g = 9 8 m/sec2

Neha Gupta · Accepted Answer

This shows Ravi's care ness towards his friend

(b)
for the first ball initial speed is zerou = 0h = 100 mlet x is the distance travelled by the first  balland t is the time at which two balls meetx = ut+0
5gt2x = 0+0 5gt2x = 0
5gt2  ------- (1)distance travelled by the second ball is 100-xvelocity is 25 m/s100-x = 25t-0
5gt2 --- (2) on solving these two equations we gett = 4 sand x = 80 m