I would think it is B. The pitchblende sample contained an unknown radioactive element.
To point out that relationships call for regular maintenance. Cars need regular oil checkups and such and so do relationships.
Hope this helps :)
<span>345/115=3
3*24=72
the answer is B. 72 </span>
An elastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies after the encounter is equal to their total kinetic energy before the encounter. Elastic collisions occur only if there is no net conversion of kinetic energy into other forms (such as heat or noise).
Answer:
21.22s
Explanation:
initial velocity u=87m/s
acceleration a=-4.10 m/s²
velocity v=0
time t=?
From Newton's first law of motion
V=u+at
0=87-4.10t
-87=-4.1t
t= -87/-4.1
t= 21.22 s
