Homework Help: physics

Posted by molly on Tuesday, June 21, 2011 at 8:22pm.

1. An object traveling at a constant speed of 22m/s begins to experience a force of 15N in the opposite direction of its motion. (Hint given: Start by finding objects acceleration)

a. How long will it take for the 8kg object to come to a complete stop once it experiences the force?
b. If the object was traveling in a straight line, how far did the object travel as it slowed down?

physics - Henry, Wednesday, June 22, 2011 at 6:30pm
a = -F / m = -15 / 8 = -1.875m/s^2.

a. Vf = Vo + at,
t = (Vf - Vo) / a,
t = (0 - 22) / -1.875 = 11.73s.

b. Vf^2 = Vo^2 + 2ad,
Solve for d and get:
d = (Vf^2 - Vo^2) / 2a,
d = (0 - (22)^2) / -3.75 = 129.1m.

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