Automobile engines are . a. internal combustion engines b. external combustion engines c. heat pumps d. heating systems

a. internal combustion engines

Explanation:

Automobile engine are engines that requires the fuel to be burn at highest possible temperature to be able to provide torque to the engine and then to the wheel of the vehicle. Internal Combustion is made possible through the use of Spark Plug, Piston, Fuel (Petrol or Diesel). All these process occur in the Engine Cylinder.. The more and powerful the Piston in the Cylinder, the higher the energy the engine will generate.

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i just did this and got a 100.

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s