Explanation:
We have,
Speed of plane a is 900 km/h
Plane b is moving at a rate of 
It is required to find which plane is faster. To find which plane is faster, we need to compare their speeds.
Speed of a plane a is 900 km/h and that of plane b is 50 km/h. So, we can say that plane a is moving faster.
Answer:
I think D sorry if I'm wrong
Compression and rarefraction, the other guy's answer it's wrong
The weight of the object on mars is about 80n
Answer:
one of the graph is postion-time graph while the other one is velocity-time graph