Question

certain height It reaches ground
A ball is falling freely froma
after 3 second. If 30 m/s is the
velocity of the ball while touchic
ing the ground then.
What is the final velocity of the ball
please send answer​

Answer 1

$g = 10 \: ms {}^{ - 2}$

$u = 30 \: ms {}^{ - 1}$

$t = 3 \: sec$

using formula,

$h = ut + \frac{1}{2} gt {}^{2}$

$h = 30 \times 3 + \frac{1}{2} \times 10 \times 3 \times 3$

$h= 90 + 5 \times 9$

$h = 90 + 45$

$h = 135 \: m$

Now,

$v {}^{2} = u {}^{2} + 2gh$

$v {}^{2} = (30) {}^{2} + 2 \times 10 \times 135$

$v {}^{2} = 900 + 2700$

$v {}^{2} = 3600$

$\huge\purple{\boxed{\pink{v = 60 \: ms {}^{ - 1}}}}$

$Final \: Velocity \: is \: 60 \: ms {}^{ - 1}$

Mark Brainliest