A flea jumps straight up to a maximum height of 0.490m What is its initial velocity as it leaves the ground?

At its max height 0.490m its velocity is 0

therefore we can use the equation of motion that

v^2 = u^2 + 2as

u^2 = 0 - 2 x -9.80(negavtive for direction) x 0.490

therefore u^2 = 7.644

= root 7.644

initial velocity = 2.76 m/s to 2 decimal places

hope it helps

To calculate the time you can use another equation of motion

t = (v-u)/a

substitute in :

0-2.76/-9.8

= 0.28seconds

but that's only half the journey to its maximum point therefore the time to reach back to the starting point is double this as the acceleration is the same

so the answers 0.56 seconds - im sure lol