Question

13 A car, travelling on a straight horizontal road, has 1.6 MJ of kinetic energy. It accelerates for 20 s until it has 2.5 MJ of kinetic energy. What is the average power output used to increase the kinetic energy of the car? А 45W B 205 W C 45kW D 205 kW​

Answer 1

Answer:

(C) 45kW

Explanation:

Power= Change in K.E / Time

Answer 2

Given :  A car, travelling on a straight horizontal road, has 1.6 MJ of kinetic energy. It accelerates for 20 s until it has 2.5 MJ of kinetic energy.

To Find : What is the average power output used to increase the kinetic energy of the car?

А 45W B 205 W C 45kW D 205 kW​

Solution:

Power = Energy / Time

Change in Energy  = 2.5  - 1.6  = 0.9  MJ

= 900 kJ

Time = 20 sec

Power = 900 /20   kJ/s

= 45 kJ/s

J/s  = Watt

= 45 kW

average power output used to increase the kinetic energy of the car = 45 kW

Learn  More:

calculate energy and power consumed by 8 ohm resistor in one ...

brainly.in/question/10685640

Electricity consumed by a household using incandescent bulb is ...

brainly.in/question/9687864