Jeremy analyses one of his parachute jumps.
He draws a graph showing his velocity up to the opening of his parachute.
Parachute
opening
a) Estimate Jeremy's
acceleration at t = 10s
to 1 decimal piace.

b) Estimate his average
speed for this part of
the jump.
Give your answer to
two significant figures.
Velocity (v in m/s)

2men and 7 boys can do a piece of working 4 days. it is done by 4 men and 4 boys in 3 days how long would it take for 1man or one boy to do it alone

Four airplanes carrying a total of 400 passengersarrive at the detroit airport. the airplanes carry, respectively,50, 80, 110, and 160 passengers. a) one of the 400 passengers is selected uniformly at random. let x denote the number of passengers that were on theairplane carrying the randomly selected passenger. find var(x)for x as given in the problemb) one of the 4 airplane drivers is also selected uniformly atrandom. let y denote the number of passengers on the chosen driver’s airplane. find var(y) for y as given in the problem

Which of the following parabolas opens down?