A batsman hits back a ball straight in the direction of the bowler without changinf the initial speed of 12m/s . If the mass of the ball is 0.15 kg , determine the impulse imparted to the ball . (Assume linear motion of the ball)

Question

anonymous · Answer

here impulse = 12*0.15 - (-12*0.15) = 3.6 units

anonymous · Answer

I understand why you did 12*0.15  ,    but after that i didn't get u

anonymous · Answer

m--> mass
and u --> initial velocity
now initail momentum = -mu
and final momentum is also mu  (-ve sign is for direction of the ball)
so change in momentum or impulse= mu -(-mu)=2mu

anonymous · Answer

Oh i get it 
 so for linear motion impulse is 2mu , can we say that

anonymous · Answer

@matricked ?

anonymous · Answer

not always 
you need to know the final momentum and the initial momentum

anonymous · Answer

ohk!!