A man throws a ball vertically upward and it rises through 20 𝑚 and returns to his hands. What was the initial velocity (𝑢) of the ball and for how much time (𝑇) it remained in the air [𝑔 = 10𝑚/𝑠 2 ]

Question : A man throws a ball vertically upward and it rises through 20 𝑚 and returns to his hands. What was the initial velocity (𝑢) of the ball and for how much time (𝑇) it remained in the air [𝑔 = 10𝑚/𝑠 2 ]

(A) 𝑢 = 10𝑚/𝑠,𝑇 = 2𝑠

(B) 𝑢 = 10𝑚/𝑠,𝑇 = 4𝑠

(C) 𝑢 = 20𝑚/𝑠,𝑇 = 2𝑠

(D) 𝑢 = 20𝑚/𝑠,𝑇 = 4s

Answer : option (D)

Solution :

A man throws a ball vertically upward and it rises through 20 𝑚 and returns to his hands. What was the initial velocity (𝑢) of the ball and for how much time (𝑇) it remained in the air [𝑔 = 10𝑚/𝑠 2 ]
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