Question : A ball is dropped from top of a tower of 100𝑚 height. Simultaneously another ball was thrown upward from bottom of the tower with a speed of 50 𝑚/𝑠 (𝑔 = 10 𝑚/𝑠 2 ). They will cross each other after
(A) 1𝑠
(B) 2𝑠
(C) 3𝑠
(D) 4𝑠
Answer : option (B)
Solution :
