If a flea can jump straight up to a height of 21.1 cm, what is its initial speed as it leaves the ground, neglecting air resistance?

The flea jumps at high velocity, reaches zero velocity at the maximum height 21.1 cm before starting to fall. Solve for initial velocity given final velocity is zero.

since time is not given, use the equation:

v^2 = u^2 + 2as

convert gravity or displacement to have same units. 9.8 m/s = 980 cm/s

0 = u^2 + 2 (-980) (21.1)

41356 = u^2

sqrt (41356) = u

203.4 cm/s = u