0

I) from second equation of motion, s = ut + 1/2 at^{2}.

The equation can be re-written as:

H = ut + 1/2 gt^{2} [because the ball is falling with gravity]

U = 0

H = 1/2 gt^{2}

g = 10 m/s^{2}

t = 5 seconds

H = 1/2 (10)(5)^{2}

= 125 m

Ii) from third equation of motion, v^{2} = u^{2} + 2as.

The above equation can be written as:

V^{2} = u^{2} + 2gH [because the ballnisbfalling with gravity]

U = 0

V^{2} = 2(10)(125)

V^{2 }= 2500

V = 50 m/s

Your Answer