Author Question: Which of the following quantities, if any, remain constant as a projectile moves through its ... (Read 123 times)

natalie2426 · **on:** Jul 28, 2018

Which of the following quantities, if any, remain constant as a projectile moves through its parabolic trajectory?

(i) speed
(ii) acceleration
(iii) the horizontal component of velocity
(iv) the vertical component of velocity

1.(i) only
2.(ii) and (iii)
3.(ii) and (iv)
4.all of them

Question 2

A stream of water is leaking from the roof of a train into the cab below, to the dismay of the passengers in the cab. The train is moving with a constant speed of 100 km/hour. An observer from outside the train sees the situation through the train window as the train passes by. Which observer(s) see a parabolic path for the water as it moves through the air of the cab?

1.the passengers within the cab
2.neither the observer from outside the train nor the passengers within the cab
3.both the observer from outside the train and the passengers within the cab
4.the observer from outside the train