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A ball of mass 1\ kg moving with a speed of 10\ ms^{-1} rebounds after a perfect elastic collision with the floor. Calculate the change in linear momentum of the ball.
 
Mass of a ball (m= 1\ kg

Velocity of the ball before collision (u) =  ms^{-1}
 
Velocity of the ball after collision (v) = ms^{-1}
 
The formula to calculate the change in linear momentum is
 
Δp=i×(ii)
 
On substituting the known values, we get
 
Change\ in\ linear\ momentum\ of\ the\ ball =  kg\ ms^{-1}