Question : Two balls are dropped to the ground from different heights. One ball is dropped 2 s after the other but they both strike the ground at the same time. If the first ball takes 5 s to reach the ground, then the difference in initial heights is (g = 10 ms−2 )
(A) 20 m
(B) 80 m
(C) 170 m
(D) 40 m
Answer : option (B)
Solution :
