Question

Why do we use h = ut + 1/2gt² for upward motion and h = ut - 1/2gt² for downward motion?

Answer 1

Why do we use h = ut + 1/2gt² for upward motion and h = ut - 1/2gt² for downward motion?

Good question,

Here is your perfect answer!

As S = ut + 1/2at² is second equation of motion.

In downward direction , motion is in the direction of gravity, so g be positive.

In upward direction, motion is in opposite direction of gravity, so g is negative.

So h = ut + 1/2*-g * t²

= ut - 1/2gt².

Answer 2

Heya ______

Ques :- Why do we use h = ut + 1/2gt² for upward motion and h = ut - 1/2gt² for downward motion???

Ans ______

It's the second equations of newton's law of motion :-

S = ut + 1/2 at^2

So___ In downward motion ... motion is just direct ot equal sided by the gravity so we use + gravity and the equation goes ___

s = ut + 1/2 gt^2

But ____ In upward motion ... motion is just inverse or opposite direction to gravity so equation goes as ____

s = ut + 1/2 -gt^2

That is __ s = ut - 1/2 gt^2 ...

Thank you