Question

The particle is projected vertically upward with velocity u .Find its velocity after time t....
Ans. v=u-gt
plz explain this equation​

Answer 1

Since we know that,

According to first equation of motion :-

v = u + at

Where v = final velocity,

u = initial velocity, a = acceleration and t = time.

When any object is thrown vertically upward the value of a is replaced by g which represents 'acceleration due to gravity'.

New equation : v = u + gt

Moreover, here the object is thrown against gravity so, value of g will e negative ( -ve ).

Final equation,

v = u + (-g)(t)

v = u - gt