Question

# A motor drives a body along a straight line with a constant force. the power P developed by the motor must vary with time t as

Solution

: farce is const

( Rightarrow ) accen-(a) is const

[

begin{aligned}

P &=f cdot v

&=m a v

P &=m a a t

&=m a^{2} t

end{aligned}

]

( Rightarrow quad P alpha t )

(a) option Pl 2 give rating