c
Explanation:
electronic balance must always be at zero to prevent errors in measured value
The car travels at twice the velocity of the truck.
Explanation:
As we know that momentum is defined as the product of mass and velocity
so here we know
mass of the car = 900 kg
mass of the truck = 1800 kg
now let say that the speed of car =
speed of truck =
so if the momentum of car and truck is same
so we can say that car will move with double the speed of truck