A battery stores J of energy and powers an electric motor whose power output behaves…
PHYSICS · Single correct · CBSE · Physics · Current Electricity · Current Electricity
Problem
A battery stores 1.8×105 J of energy and powers an electric motor whose power output behaves as follows: the motor delivers a constant 2.0 kW for the first t seconds, after which its power decreases linearly to zero over the next 10 s. If the battery is completely discharged by this operation, what is the value of t?
(a) 90 s
(b) 85 s
(c) 75 s
(d) 95 s