If a $2 kg$ object is constantly accelerated from $0m/s$ to $15 m/s$ over $12s$ , how much power musy be applied at $t= 6$ ?

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Answer 1 · 2017-09-10T11:17:02

The power is $=18.75W$

$a=(v-u)/t=(15-0)/12=15/12=1.25ms^-2$

The force is

$F=ma=2*1.25=2.5N$

The speed at $t=6s$ is

$v=u+at=0+1.25*6=7.5ms^-1$

The power is

$P=Fv=2.5*7.5=18.75W$

If a 2 kg2 kg object is constantly accelerated from 0m/s0m/s to 15 m/s15 m/s over 12s 12s, how much power musy be applied at t= 6 t= 6 ?