O The magnitude would be half that in part (a). Need Help? A rifle with a weight
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O The magnitude would be half that in part (a). Need Help? A rifle with a weight of 35 N fires a 5.s-g bullet with a speed of 250 m/s. (a) Find the recoil speed of the rifle. 016 b) If a 775-N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle. 325 liffers significantly from the correct answer. Rework your solution from the beginning and check each step Enter a number Need Help? Read I ubmit Answer Save Progress Practice Another Version o 2.1/2 points | Previous Answers SerCP10 6.P023 A 45.0-kg girl is standing on a 130-kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictic a constant velocity of 1.55 m/s to the right relative to the plank. (Let the direction the gir is moving in be positive. Indicate t right relative to the plank. (Let the direction the girl is moving in be positive. Indicate t (a) What is her velocity relative to the surface of ice? 1.15 m/sExplanation / Answer
(A) M_rifle = 35 / 9.8 = 3.57 kg
Applying momentum conservation,
0 = (3.57 v) - (5.5 x 10^-3 x 250 )
v = 0.385 m/s
(b) 0 = ( ( (35+ 775)/9.8) (v)) - (5.5 x 10^-3 x 250)
v = 0.017 m/s
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