Question

A stone is thrown vertically upward with a speed of 49 metre per second then the velocity of the stone 1 second before it reaches the maximum height

Answer 1

v=u+at

Total flight time is 49/9.8=5seconds

So velocity at 4 seconds would be (using the same formula)

v=49-9.8*4

=49-38.2

=10.8m/s