Question

an object moving at 15m/s slows uniformly at the rate of 3m/s each second for a time of 2 sec..determine final velocity average velocity and distance moved

Answer 1

Gives

$u=15m/sec$

acceleration (a)=$-\frac{3}{1} m/sec^2$

acceleration (a)=-3$m/sec^2$

Time(t)=2sec

Final velocity

$v=u+at$

$v=15-3\times2$

$v=9m/sec$

Distance move

$s=ut+\frac{1}{2}at^2$

$s=15\times2+\frac{1}{2}(-3)\times2^2$

s=24 m

average velocity

_Vave=$\frac{displacement}{time}$

v_ave=$\frac{24-0}{2-0}=12m/sec$