Homework Statement
two hot air balloons are 48.8 and 52.2 meters above the ground. a person in the left balloon observes that the right balloon is 13.3 deg above the horizontal. what is the horizontal distance between the two balloons?
Homework Equations
The Attempt at a Solution...
I understand that I'm just not sure which velocity I'm supposed to use on each step that's where I'm stuck because everytime I tried it I got the answer wrong.
Homework Statement
a train is moving at 26.1m/s. 12.7 sec later its speed is 15.9m/s. find the trains acceleration- -.803m/s^2
what additional time would be necessary to bring the train to a stop if it continues to accelerate at the same rate calculated?
-.803=0-15.9/t which is 19.8...
so i take 340=65.8/t and i get that it took .19 seconds? but i don't know what to do with that because I'm not looking for a time I'm looking for a speed.
Homework Statement
to qualify for a race a car must achieve an average speed of 254 km/hr on a track 1600 meters long. if a car covers half the track with an average speed of 227.5 km/hr what minimum average speed must it have the second half to qualify?
Homework Equations...
Homework Statement
shoot a ball at a drum 65.8 meters away from you. you hear the impact .72 seconds later. if the speed of sound on that day was 340m/s how fast must the ball be traveling?
Homework Equations
speed=distance/time
The Attempt at a Solution
i found that the ball was...
Homework Statement
a negative acceleration must mean an object is slowing down.
if an object has a negative velocity and a negative acceleration the object is slowing down.
distance can never be negative
if an object has a negative velocity and a positive acceleration the object is speeding...