A 1.2-kg object moving with a speed of 8.0 m/s collidesperpendicularly with a wa

Question

A 1.2-kg object moving with a speed of 8.0 m/s collidesperpendicularly with a wall and emerges with a speed of 6.0 m/s inthe opposite direction. If the object is in contact with the wallfor 2.0 ms, what is the magnitude of the average force on theobject by the wall? a. 9.8 kN b. 8.4 kN c. 7.7 kN d. 9.1 kN e. 1.2 kN A 1.2-kg object moving with a speed of 8.0 m/s collidesperpendicularly with a wall and emerges with a speed of 6.0 m/s inthe opposite direction. If the object is in contact with the wallfor 2.0 ms, what is the magnitude of the average force on theobject by the wall? a. 9.8 kN b. 8.4 kN c. 7.7 kN d. 9.1 kN e. 1.2 kN

Explanation / Answer

mass m = 1.2 kg Initial speed u = 8 m / s Final speed v = - 6 m / s time t = 2 ms = 2 * 10 ^ -3 s We know force = impulse / time                             = m ( v - u ) / t Force F = 1.2 ( 8 + 6 ) / 2 * 10 ^ -3             = 8400 N

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