Plutonium -241 is an isotope of plutonium that is highly radioactive and is used in some nuclear reactors and many nuclear weapons . It has a half -life of 14.4 years . If 1000g of Pu - 241 is placed in storage at a weapons plant , how much will still be remaining after 28.8 years ? A. 125g
B. 250g
C. 500g
D. 1000g

The Answer is B I just did it

Aspring with a mass of 2 kg has a damping constant 14 kg/s. a force of 3.6 n is required to keep the spring stretched 0.3 m beyond its natural length. the spring is stretched 0.6 m beyond its natural length and then released. find the position of the mass at any time t. (assume that movement to the right is the positive x-direction and the spring is attached to a wall at the left end.)

Which of the following statements accurately describes the sign of the work done on the box by the force of the push? a. positive b. negative c. zero

Aforce is a vector quantity because it has both?