Aboy of mass 40kg slides from rest down a straight slide of length 5m. the slide is inclined to the horizontal at an angle of 20°. the coefficient of friction between the boy and the slide is 0.1. by modelling the boy as a particle, find:
a) the acceleration of the boy,
b) the speed of the boy at the bottom of the slide.

Kevin is an insurance salesman. when he sells a policy, he makes 20 percent of the policy premium (p) up front; then each year the policy is active, he receives 15 percent of the original premium. which equation could be used to figure his total commission on a policy that has been active for five years? c=0.80p c=0.20p + 0.15p c=0.35p + 4(0.15) c=0.95p

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air

Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g