I was dealing with a problem which stated that two objects were moving with same velocity v and one was a car with mass m and another a truck with mass M, such that M > m. They collided and came to a halt. Their collision lasted for 1 second. Which experienced a greater force of impact?

After searching a little bit everyone seems to have a different equation for force of Impact. What’s really force of impact and how is it different from force and Impulse? Thanks!