Aforce platform is a tool used to analyze the performance of athletes measuring the vertical force that the athlete exerts on the ground as a function of time. starting from rest, a 67.0-kg athlete jumps down onto the platform from a height of 0.720 m. while she is in contact with the platform during the time interval 0 < t < 0.800 s, the force she exerts on it is described by the functionf = 9 200t − 11 500t2where f is in newtons and t is in seconds.(a) what impulse did the athlete receive from the platform? n · s up(b) with what speed did she reach the platform? m/s(c) with what speed did she leave it? (d) to what height did she jump upon leaving the platform?

a.

b.

c.

d.

Explanation:

Given: , ,

a.

b.

Starting from the rest

c.

Solve to vf

d.

from 1609, galileo galilei used the recently invented telescope to observe the sun, moon and planets. he saw the mountains and craters of the moon, and for the first time revealed the planets to be worlds in their own right. galileo also provided strong observational evidence that planets orbited the sun.

his discoveries about the moon, jupiter's moons, venus, and sunspots supported the idea that the sun - not the earth - was the center of the universe, as was commonly believed at the time.galileo turned his gaze toward venus, the brightest celestial object in the sky - other than the sun and the moon.

i believe it is b. what was the cause of the big bang

hope this !