In a classroomdemonstration, a glider moves along an inclined track with constan

Question

  In a classroomdemonstration, a glider moves along an inclined track with constantacceleration. It is projected from the low end of the track with aninitial velocity. After 8.50 s have elapsed, it is 102.0 cm from the low end and is moving alongthe track at a velocityof -14.7 cm/s. Find theinitial velocity and the acceleration. initial velocity cm/s acceleration cm/s2

  In a classroomdemonstration, a glider moves along an inclined track with constantacceleration. It is projected from the low end of the track with aninitial velocity. After 8.50 s have elapsed, it is 102.0 cm from the low end and is moving alongthe track at a velocityof -14.7 cm/s. Find theinitial velocity and the acceleration. initial velocity cm/s acceleration cm/s2

initial velocity cm/s

Explanation / Answer

Vav = (Vi + Vf ) / 2 S = Vav t = (Vi + Vf ) t / 2 Vi = 2 S / t - Vf = 204 / 8.5 +14.7 = 38.7 a = (Vf - Vi ) / t = (-14.7 - 38.7) /8.5 = -6.28 cm/s2 s = Vi t + 1/2 a t2 = 38.7 * 8.5 - 6.28* 8.52 / 2 = 102 cm s = Vi t + 1/2 a t2 = 38.7 * 8.5 - 6.28* 8.52 / 2 = 102 cm

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