While waiting in their car at a stoplight, an 80-kg person and their car are suddenly accelerated to a speed of 5 m/s in 0.3 seconds as the result of a rear-end collision.

1. What is the impulse on the person?
a. 400 kg. m/s
b. 24 kg-m/s
C. 1333.33 kg. m/s
d. 16.67 kg. m/s

Answer: fn = wcos50 = 38.89(9.81)(cos50) = 245.23 n

Answerthe energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.explanationwe define electric potential as the ratio electric potential energy to the charge,    then the following gives us the potential difference,      the formula  may be on your formula sheet.the change in electric potential energy would be the energy that would needed to move it from point a to point b. solving for that, we get    using q = 8.00  × 10⁻¹⁹ c and  δv = 2.00 v, we get    the energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.

Answerthe valence of an element or radical is equal to the number of positive or negative charges on the ion.