This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Cars, Aeroplanes, Rockets are streamlined in order to reduce frictional forces such that the bodies are move fastly and easily.
2 5 2
Aeroplanes and cars have a streamlined shape because it reduces the amount of air drag/air resistance,rhus allowing less amount of energy  to be wasted.if they r streamlined when they flow through the air,the car can move smoothly,non clumsy like moments