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Thread: particle accelerating

  1. #1
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    particle accelerating

    a particle passes point P with speed 10 m/s and moves in a straight line with uniform acceleration to a point Q . in the first second of motion after passing P it travels 14 m. in the last 5 seconds of motion before reaching Q it travelled 7/10 of |PQ|. find the acceleration of the particle and the distance from P to Q. i found out the acceleration by using uvast equations. s=ut +.5at^2 14=10(1)+.5(a)(1)^2 a=8 . however i dont know how to find the distance
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  2. #2
    Senior Member zzephod's Avatar
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    Re: particle accelerating

    Let P be at x=0, and Q at x=D. Introduce a point R at x=0.3D, it takes the particle 5 seconds to go from R to Q,

    Try taking it from there, and ask again if you get stuck.
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