A ball of mass is thrown vertically upwards by applying a force by hand. If the hand moves while applying the force and the ball goes up to height further, find the magnitude of the force. (Take `g = 10 ms^(-2)`)

Explanation

`F=ma, F= m. (dv)/(dt)`
` 3x = m. (dv)/(dx).(dx)/(dt) , 3x=8. (dv)/(dt).v , 3x dx = 8v dv `
` 3int_(2)^(10)x dx = 8 int_0^(v) v dv , 3[(x^(2))/(2)]^(10)=8[(v^(2))/(2)]^(v) , 3[100-4]=8v^(2) , v^(2) = (3 xx 96)/(8) =36 , v=6 m//s`