A bullet is fired at a speed of 350m/s vartically upwards into a wooden block.How high will the block rise when the bullet becomes embedded in it??
A bullet is fired at a speed of 350m/s horizontally into a wooden block.How far will the block moves when the bullet becomes embedded in it??
thx~
(可唔可以用energy 黎計???點解得?點解唔得?)
更新1:
答案唔係50m....第一題答案得幾米....
更新2:
咁答案係乜... 我點知呢度有乜external force 或者有冇 loss of energy