Question

If you jump into water from a higher ground, how much speed is m/s will you have built up during your fall if you touch the waters surface after 1.5 seconds

Answer 1

my speed was 1.5 m/ 1.5 second

Answer 2

The speed you'll acquire is given by:

$v = \frac{1}{2}gt^2$

Taking g to be equal to $10m/s^2$, and substituting the value of t, we get:

$v = \frac{1}{2} * 10 * \frac{9}{4} m/s= \frac{90}{8} m/s= 11.25 m/s$