Which best describes Nelson Mandela's role in ending apartheid? His election gave him control of the government, and he forced democratic changes.

He wrote a new constitution prohibiting racial discrimination.

He led a popular uprising and overthrew the existing government.

He used his imprisonment to gain worldwide condemnation of the government's

policies

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)