1903 kg car travels at a speed of 11.7 m/s. what is its kinetic energy? answer in J units

How fast would a 30-kg kid need to run in order to have the same kinetic energy as an 8.0-g bullet fired at 400 m/s, in m/s? Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.

Answer both or NONE   Question1 -  For exercise, an athlete lifts a barbell that weighs 400 N from the ground to a height of 2.20 m at a constant speed in a time of 1.60 s. What is the metabolic energy, in kJ (kiloJoule)? Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.   Question2 -  For exercise, an athlete lifts a barbell that weighs 400 N from the ground to a height of 2.20 m at a constant speed in a time of 1.60 s. How much thermal energy is created in this process, in kJ (kiloJoule)? Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.

2. A car moving east with a speed vo has kinetic energy Ko. If the same car moves west with a speed 2vo, its kinetic energy will be (a) Ko (b) 2Ko (c) -2Ko (d) 4Ko (e) -4Ko

5. A car, 1000 kg, increases its speed from 12.0 m/s to 21/0 m/s. (a) Find the change in the kinetic energy of the car. (b) Determine the average power if the time it takes you to increase speed is 6.0 seconds.

7. Car 1 has half the mass of car 2, but they both have the same kinetic energy. If the speed of car 1 is v = 10.0 m/s, what is the speed of car 2?

A different car accelerated from 0.12 m/s to 0.52 m/s. The acceleration of the car was 0.040 m/s². The work done to accelerate the car was 0.48 J. Calculate the resultant force needed to accelerate the car.

A 69 kg passenger in an airplane has a kinetic energy of 4.3x 10^6 j. What is the speed of the airplane

a) What is the kinetic energy of an automobilewith a mass of 1299 kg traveling at a speed of11 m/s?Answer in units of J. b) What speed would a fly with a mass of0.629 g need in order to have the same kineticenergy as the automobile?Answer in units of m/s.

A bird is flying at 3 m/s and its mass m=0.8 kg. Determine its Kinetic Energy. Include units