# Physics

A mass m is traveling at an initial speed of v0 = 25.0 m/s. It is brought to rest in a distance of 62.5 m by a force of 15.0 N. The mass is?

Could you just enlighten me on what formula to use please.... little lost although I think the answer is 37.5kg am I anywhere close?

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1. You use the equation Vf^2 = Vi^2 + 2ad to solve for acceleration. Vi = 25; Vf = 0 (because it "slows to rest"). When you do that acceleration should come out to be 5 m/s^2. Now use the F=ma formula and plug in 15N for force and 5 m/s^2 for acceleration. Your mass should be 3kg.

You're Welcome. :)

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2. 1.50kg

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