A ball kicked vertically up attains a height of 19.6m and returns to the point of throw. If the ball is in air for four second, then the value of acceleration due to gravity is

Question : A ball kicked vertically up attains a height of 19.6m and returns to the point of throw. If the ball is in air for four second, then the value of acceleration due to gravity is

(A) 4.9ms^{-2}

(B) 9.8ms^{-2}

(C) 10ms^{-2}

(D) 2 × 4.9ms^{-2}

Answer : option (B)

Solution :

A ball kicked vertically up attains a height of 19.6m and returns to the point of throw. If the ball is in air for four second, then the value of acceleration due to gravity is
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