2. A 25 kg child riding a bicycle travels to the east at 5 m/s. If he used 50 N of force push the brake pedal in the opposite direction, find the child's initial velocity if it takes 10 s to slow down,
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Formula?
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Solution?
50: 251
V
Ft= m (Vf-Vi)

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.