Numerical Problem:
 
The graph represents the variation of velocity with time for a ball of mass \(50\ g\) moving on a concrete floor. Calculate the ball’s acceleration and the frictional force applied by the floor.
  
Ncert example X.jpg
v-t graph
 
The acceleration (\(a\)) is found using,
 
From the Newton's second law, We know that,
 
 
Acceleration\(=\) \(m\ s^{-2}\)
 
Frictional force of the floor on the ball \(=\)  \(N\)
 
[Note: Enter your answer with two decimal digits]