碰撞[(+against)]
The ball hit against the window.
球撞在窗子上。
The ship hit a rock and wrecked.
船觸礁撞毀了。
crash
(發出猛烈聲音地)碰撞,倒下,墜落
The motorcycle crashed into the fence.
摩托車猛地撞在籬笆上。
(飛機等)墜毀,撞壞
An airliner crashed west of Denver last night.
昨夜壹架客機在丹佛西邊墜毀。
collide
碰撞;相撞
They collided with another ship.
他們的船與另壹條船相撞。
就妳第二個問題，我查過字典
collide通常是兩輛車撞在壹起
crash也比較少用於車撞到人
所以hit應該較適合
E.g.:The man is hit by a car.