The half -life if Po - 218 is three minutes . How much of a 2.0 gram sample remains after 15 minutes? Suppose you wanted to buy some of this e , and it required half an hour for it to reach you. How much should you order if you need to use 0.10 gram of this material ?

He sandals were out in the sun so the got hotter. which is why her feet felt hot.

I'm having some difficulty seeing the diagram clearly.but the question says there's a net inward force on the object.so we know right away,  from newton's 2nd law of motion, thatthat baby is accelerating.  it doesn't even matter which way thenet force is pointing.  if there's any net force, then either theobject's speed or else its direction must be changing.