Question

A stone is projected vertically upwards with a velocity of 20 ms-1 . If the stone reaches a height of n meter , find the value of n taking the acceleration due to gravity to be 10 ms-2

Answer 1

$for \: vertically \: projected \: body \\ acceleration \: a = - g \\ v = 0 \: \: \: \: \: \: u = 20 \\ {v}^{2} - {u}^{2} = 2 \times a \times s \\ {0}^{2} - {20}^{2} = 2 \times ( - 10) \times n \\ - 400 = - 20 \times n \\ n = 20m.$