can someone help me with this ;]
a ball measures 1.5 = t for a drop of 1.88 m
the picture is attached https://db.tt/cYRnDpiX

Question

kohai · Answer

So are you looking for the acceleration?

anonymous · Answer

yeah

anonymous · Answer

how do you do that?

kohai · Answer

Alright, I'll help you in the manner I learned in physics. You first need to find the velocity of this, which is 
V=d/t
Velocity = distance/time
What is that?

anonymous · Answer

1.25 m/s?

anonymous · Answer

now what?

kohai · Answer

Why are there negatives on the exponent... lol. The unit for acceleration is m/s^2

kohai · Answer

Oh. Oh I see. It's asking about acceleration due to gravity. The acceleration due to gravity is always -9.8m/s^2

yttrium · Answer

Well, generally in physics problems like this, g is always equal to 9.81 m s^-2, but to satisfy the conditions given by the problem we have to use another value for g.

we can use $$h = V_{o}t \pm \frac{ 1 }{ 2 } g t^2$$ (a derived kinematic equation)

@t = 1.5, h = 1.88, Vo = 0, since it is a free-fall

Hence,
$$1.88 = +0.5 g(1.5)^2$$
g = 1.67 m s^-2 (approximately)

yttrium · Answer

Note: The sign is positive because the motion direction is the same as the gravitational direction.

yttrium · Answer

and to answer you @kohai ms^-2 is the same as m/s^2.
Recall your math, negative exponents means a base reciprocal

perl · Answer

great explanation