Yes.
friction, drag, and propulsion force
Increasing a vehicles weight will decrease it's acceleration, braking performance, cornering performance and life. It also increases the cars fuel consumption and tyre wear.
Acceleration is change of velocity divided by time; so if the velocity doesn't change, acceleration is zero.
Gravity affects a car on a slope the same as it affects a car on a horizontal surface. The weight (force) of the car is the same whether it's on a slope or a horizontal surface. Weight is equal to the mass of the car times the acceleration due to gravity (9.8m/s2).
Cars don't get better gas or mileage.
Seat belts protect you from the impact of a collision, not from speed or acceleration.
a surface with an air intake
A vehicles acceleration is dictated by mass, power, and traction. Reducing the first and increasing the last two will positively affect an automobiles acceleration.
because of the polution
There are many factors that may detract from manufacturing more fuel efficient cars. Resources and money are 2 such factors.
Bugatti Veyron Super Sport 0-60mph in 2.4 seconds
3 ms-2