1.

A ball is dropped from a high rise platform at t = 0 starting from rest. After 6 seconds another ball is thrown downwards from the same platform with a speed v. The two balls meet at t = 18s. What is the value of v? \[(take\text{ }g=10\text{ }m/{{s}^{2}})\]

A. 75 m/s  
B. 55 m/s
C. 40 m/s  
D. 60 m/s
Answer» B. 55 m/s


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