A0.005 kg arrow hits a target and sticks to it. the arrow and the target, with a combined mass of 0.20 kg go off together at 4 m/s. how fast was the arrow moving at the moment of impact?

veleocity of arrow at moment of impact=164m/s

Explanation:

Using the formula ;

m1u1 + m2u2=(m1+m2)v

m1=0.005kg, m2=0.2kg, u1=? u2=0 (target is at rest), v=4m/s

0.005*u1 + 0.2*0=(0.005+0.2)4

0.005u1 =0.82

u1= 0.82/0.005

u1=164m/s

d. air pressure decreases as altitude increases.