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The firing mechanism of a toy rifle is made up of a spring whose constant is unknown. When the spring compresses 0.12m, the rifle, if fired vertically, is capable of launching a 35g projectile up to a maximum height of 20m above the position of the projectile prior to firing. Ignore the friction forces and determine the spring constant.
How fast is the projectile at point B?

090=20.0 m 0 0.190 m

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Answer #1

Apply conservation of Energy h 4x2 mg (20+ 0.120 ) 200 I 2 K 612)2 s mng (20-12) 035xio x9.84 (2012) x2 (1122 -3 & Ks 958.494

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