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physics

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an object accelerates uniformly along a straight line from a velocity of 10ms-1 until 25ms-1 in 5s.
a)the velocity of the object during the first 10s of motion
b)the time taken to reach a final velocity 50ms-1

  • physics -

    V = 10 + 3 t

  • physics -

    Initial velocity U=10m/s
    Final velocity V=25m/s
    Velocity V= 25m/s-10m/s=15m/s
    Time t=5s
    (a) In 5s, the velocity v= 15m/s.
    In 10s, the velocity
    v= 15m/s×2=30m/s.
    (b) V=50m/s a=dv/t=15m/s÷5s=3m/s^2
    V=u+at
    50m/s=10m/s+(3m/s^2×t)
    50m/s=10+3t
    50-10=3t
    40=3t
    t=40/3=13.666
    Thus, t=13.67s.

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