2 3.2.1 Study: Momentum A student (m = 60 kg) stands stationary on a skateboard, holding a heavy gym bag
(m= 10 kg). If she throws the bag with a velocity of 5 m/s forward, what is her
velocity? Remember: The direction is determined by the action and reaction forces.
Al 8 m/s backward
B. 2 m/s backward
C. O m/s
D. 0.8 m/s forward

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Accelerating forwards; fa > ff            fn                           |ff< · > fa                      |                     fgfn = fg. so ∑f is just equal to sum of fa and ff (fn and fg cancel)find the distance the pickle travels. v₀ = 0 m/sd = 6.0 mt = 4.0 suse kinematic equationd = v₀t + at²/2d = 0t + at²/2d = at²/2a = 2d/t²a = 2(6.0 m)/(4.0 s)² a = 0.75 m/s² forwards∑f = fa + ffwe are given that ff = 3.8 n backwardsfa = ∑f - fffa = ma - ff fa = (25.0 kg)(0.75 m/s²) - (-3.8n)fa = 22.55 n forwardssow = fa · dw = (22.55 n)(6.0 m)w = 135 jw = 140 jthe work done to move the object is 140 j.