Posted by **shiva** on Friday, March 23, 2012 at 5:50am.

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 -
**drwls**, Friday, March 23, 2012 at 10:15am
V = 10 + 3 t

- physics -
**Godwin I. M.**, Saturday, November 28, 2015 at 6:06pm
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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