If a $2 kg$ object is constantly accelerated from $0m/s$ to $18 m/s$ over $5 s$ , how much power musy be applied at $t= 4$ ?

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Answer 1 · 2016-02-22T22:52:39

If the accerelation is constant then so must be the force, as force=mass times acceleration ( $F=m*a$ ).

Acceleration:
$a=(Deltav)/t=(18-0)/5=3.6m//s^2$

Force:
$F=m*a=2*3.6=7,2kg*m//s^2=7.2N$

If a 2 kg2 kg object is constantly accelerated from 0m/s0m/s to 18 m/s18 m/s over 5 s 5 s, how much power musy be applied at t= 4 t= 4 ?