Rising balloon. A hot air balloon rises straight up at a rate of 120 ft per min. The balloon is tracked from a rangefinder on the ground at point p, which is 400 ft from the release point q of the balloon. Let d = the distance from the balloon to the rangefinder and t= the time in mins, since the balloon was released. Express d as a function of t.

Question

Rising balloon.  A hot air balloon rises straight up at a rate of 120 ft per min.  The balloon is tracked from a rangefinder on the ground at point p, which is 400 ft from the release point q of the balloon.  Let d = the distance from the balloon to the rangefinder and t= the time in mins, since the balloon was released.  Express d as a function of t.

anonymous · Answer

Is this right?  D(t)=sqrt (400)^2+(120t)^2