Fig 3.1 shows the speed-time graph of a firework rocket as it rises and then falls to the ground 2
rocket
moving
upwards
speed
B
time
rocket
moving
downwards
Fig. 3.1
The rocket runs out of fuel at A It reaches its maximum height at B. Al Elt returns to the ground,
(a) (0) Starte the gradient of the graph at B. gradient
.11
00 State why the gradient has this value at B.
111

Wavelength divides in half and speed stays the same.

//(b) both involve the use of levers;

Phagocytes contain digestive enzymes to facilitate the process of phagocytosis

Distance covered = speed x timethe distance traveled going against the stream = distance traveled with the stream.therefore it is the speed and the time that are the variables.as he travels the same distance both ways, speed x time is the same for each way.going upstream his speed is 4 kph; going downstream his speed is 6 kph.therefore we have two simultaneous equations: time upstream x 4 = time downstream x 6time upstream + time downstream = 60 minutestherefore we have the equation: time upstream = 6/10 hour, time downstream therefore = 4/10 hour.distance traveled at 4km/hr in 6/10 hour = 24/10 = 2.4km.check: distance traveled at 6km/hr in 4/10 hour = 24/10 = 2.4km.