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

1 Answer
Aug 11, 2017

The power is #=25W#

Explanation:

The acceleration is

#a=(v-u)/t=(15-0)/6=15/6=2.5ms^-2#

According to Newton's Second Law,

The force is #F=ma=2*2.5=5N#

The speed at #t=2s# is obtained from the equation

#v=u+at=0+2.5*2=5ms^-1#

The power is

#P=Fv=5*5=25W#