A boat has a cannon on board that faces aft. The boat is capable of traveling at 15 m/s on still water. The boat is traveling North on a river that has a current flowing south at a rate of 10 m/s. Following 20m directly behind the boat is a raft that is traveling at 13m/s relative to the water. On the raft is a clown with a hoop. The cannon fires the cannonball at 38.5∘ with velocity 20m/s. At what velocity must the clown throw the hoop in order for the cannonball to travel through it? Assume the clown throws the hoop straight up.

the pull of gravity on the rocket decreases

explanation:

as the height from which the ruler was dropped increased, the speed of the ruler at ryan's hand increased.

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray