Acat is moving at 18 m/s when it accelerates at 4 m/s2 for 2 second. what is his new velocity?

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)

The electric field inside a cell membrane is 8.0mn/c. what's the force on a singly charged ion in this field?