this is normal behaviour for a lot of pups and nothing to worry about
my mother recently bought a new pup and on the way home he whined and howled the whole time and was sick 3 times, she took him out in the car every day for short trips as Jenny said abuve,
she also brought him to my house which is only 5 min car ride away so he had a nice play with my dogs before he weny home so it would be a positive experience for him, after a while he stopped being sick and is now quiet in the car.