He was hit by a car and his body was thrown into the air.
His body bounced off the car when he was hit.
1) He was hit by a car and his body was thrown into the air.
「彼は車に轢かれ彼の体は空中に投げ飛ばされた。」
「跳ね飛ばされる」は his body was thrown into the air のように「空中に投げ飛ばされた」と言えると思います。
2) His body bounced off the car when he was hit.
「轢かれたときに彼の体は車に跳ね飛ばされた。」
bounce off で「〜に当たって跳ね返る」や「はじく」と言う意味があります。
ご参考になれば幸いです！
日本 
