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?

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First you need to find the acceleration.initial velocity=25m/sFinal velocity=0 (it stops)Distance=62.5mUse the kinematic equation Vfinal^2=vinitial^2+2ad0=25^2+2ax62.5Solving for a, a=-5m/s^2Newton's 2 nd law m=F/a  -15/-5=3kgThe mass is 3kg