Kinematics Question 232

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=10m/s2) . They will cross each other after [Or it’ssa JEE 2002]

Options:

A) 1s

B) 2s

C) 3s

D) 4s

Show Answer

Answer:

Correct Answer: B

Solution:

h1=12gt2 , h2=50t12gt2

Given h1+h2=100m

therefore 50t=100t=2 sec



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