- #1
jacy
- 76
- 0
Hello,
This is what am trying to solve
A balloon is rising at the rate of 5ft/s. A boy is cycling along a straight road at a speed of 15ft/s.when he passes under the balloon it is 45 ft above him.
How fast is the distance between the balloon and the boy increasing 3 seconds later
Please let me know if am on the right path
s^2=x^2+y^2
dy/dt = 5
dx/dt = 15
y= 45
so
2s ds/dt = 2x dx/dt + 2y dy/dt
is this correct but also we can conclude that ds/dt = 15.81,
but i think we have to find ds/dt.
In the above equation am getting two unkowns that's were am getting stuck. Please help, thanks.
This is what am trying to solve
A balloon is rising at the rate of 5ft/s. A boy is cycling along a straight road at a speed of 15ft/s.when he passes under the balloon it is 45 ft above him.
How fast is the distance between the balloon and the boy increasing 3 seconds later
Please let me know if am on the right path
s^2=x^2+y^2
dy/dt = 5
dx/dt = 15
y= 45
so
2s ds/dt = 2x dx/dt + 2y dy/dt
is this correct but also we can conclude that ds/dt = 15.81,
but i think we have to find ds/dt.
In the above equation am getting two unkowns that's were am getting stuck. Please help, thanks.