A ball rolls across a floor with an acceleration of 0.10 m/s2 in ...

[jparksx]

A ball rolls across a floor with an acceleration of 0.10 m/s2 in a direction opposite to its velocity. The ball has a velocity of 4.00 m/s after rolling a distance 6.00 m across the floor. What was the initial speed of the ball?
 
  A)
 
  4.15 m/s
 
  B)
 
  5.85 m/s
 
  C)
 
  4.60 m/s
 
  D)
 
  5.21 m/s
 
  E)
 
  3.85 m/s

Question 2

What is the radius of the smallest electron orbit in a singly-ionized helium atom?
 
  A) 1.06  10-10 m B) 1.32  10-11 m C) 5.29  10-11 m D) 2.65  10-11 m

[Sierray]

Answer to Question 1

A

Answer to Question 2

D

[jparksx]

Thank you!

[Sierray]

Always glad to help...