hi, i need help please, i have 2 questions i need their completesolutions 1) Lon

Question

hi,
i need help please, i have 2 questions i need their completesolutions

1)
Lonnie pitches a baseball of mass 0.20 kg. The ball arrives at homeplate with a speed of 40 m/s and is batted straight back to Lonniewith a return speed of 60 m/s. If the bat is in contact with theball for 0.050 s, what is the impulse experienced by the ball?

2)
A ball with original momentum +4.0 kg×m/s hits a wall andbounces straight back without losing any kinetic energy. The changein momentum of the ball is:

thanks in advance..

Explanation / Answer

1)we know that impulse    J = F*t = m *v = 0.20 * [ 40 + 60] = 20 Ns 2)The change in momentum = - 2p = - 2 * 4 = - 8 kg m /s

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