Undefinedin a gasoline engine, the area in the cylinder head where the air-and-fuel mixture is burned is called the

Combustion chamber

Expalnation

Gasoline engine,

Gasoline engine is a type of  internal-combustion engines in this engine when in the combustion chamber air and fuel mixture is burned with ignition initiated by an electric spark  that time power is generated.

50 inches should be the resultant vector

not moving. pos accel,