Afirecracker is thrown downward from a height of 2.75m above the ground, with a speed of 3.15m/s. ignore air resistance, determine the height above the ground that the firecracker would be moving at 5.23m/s.

Here in this question as we can see there is no air friction so we can use the principle of energy conservation

now here we know that

now plug in all values in above equation

divide whole equation by mass "m"

so height of the ball from ground will be 1.35 m

nah.   i'm just sleepy.

no

sodium is solid at rt