Answer: 39.2 m/s
Explanation:
You can use the kinematic equation:

We know the final velocity because it says it came to a stop. So now all we gotta do is plug in.

Krypton ... symbol Kr ... is an element. It's element number 36, because
there are 36 protons in the nucleus of every atom of Krypton.
Krypton has nothing to do with Superman, except that about 75 years ago,
the creators of Superman thought it was a cool-sounding scientific word,
so they chose it for the name of his home planet.
Answer: 2 s
Explanation: In order to solve this problem we have to use the formule of the final speed getting with a constant acceleration, it is given by;
Vfinal=Vo+a*t where Vo is zero.
so then t=Vfinal/a = (10 m/s)/5 m/s^2= 2 s
Answer: 3.55 s and 0.83 s
Explanation:
The height (in feet) of the softball is given by:
s(t)=-16t²+70t+3
we need to find the time when the ball is 50 feet above the ground:
⇒50 = -16t²+70t+3
we need to solve the quadratic equation
⇒16t²-70t+47 = 0

This gives two values of time: 3.55 s and 0.83 s