1. A 3.0-kg ball with an initial velocity of (4i +3j) m/s collides with a wall a

Question

1. A 3.0-kg ball with an initial velocity of (4i +3j) m/s collides with a wall and rebounds with a velocity of (-4i+3j) m/s. What is the impulse exerted on the ball by the wall? 2. A 2.0-kg object moving 5.0 m/s collides with and sticks to an 8.0-kg object initially at rest. Determine the kinetic energy lost by the system as a result of this collision 3. A baseball outfielder throws a baseball of mass 0.15 kg at a speed of 40 m/s and initial angle of 30°. What is the kinetic energy of the baseball at the highest point of the trajectory?

Explanation / Answer

1. Impulse= change in momentum

= m (vf - vi)

= 3 (-4i + 3j - 4i - 3j)

= - 24 i

impulse = (-24) i + 0 j kg m/s

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