A hot air balloon rising straight up from a level field is tracked by a range finder 500 ft from the lift-off point. At the moment the range finder's elevation angle is `pi/4`, the angle is increasing at the rate of 0.14 rad/min. How fast is the balloon rising at that moment.

A hot air balloon rising straight up from a level field is tracked by a range finder 500 ft from the lift-off point. At the moment the range finder's elevation angle is (pi)/(4) . The angle is increasing at the rate of 0.14 rad/min. How fast is the balloon rising at the moment ?

A balloon rises straight up at 10m/s. An observer is 40 m away from the spot where the balloon left the ground. Find the rate of change of the balloon's angle of elevation in radian per second when the balloon is 30 metres above the ground.

A balloon and a bicycle. A balloon is rising vertically above a level, straight road at a constant rate of 1 ft/sec. Just when the balloon is 65 ft above the ground , a bicycle moving at a constant rate of 17 ft/sec passes under it . How fast is the distance between the bicycle and balloon increasing 3 sec later ?

A balloon is rising vertically from a level field , suppose an on-looker sees it rising at 0.14 rad/min. when theta=(pi)/(4) (when the on -looker is 500 m away from the launch spot ), how fast is balloon rising ?

A balloon is rising vertically from a level field , suppose an on-looker sees it rising at 0.14 rad/min. when theta=(pi)/(4) (when the on -looker is 500 m away from the launch spot ), how fast is balloon rising ?

A balloon leaves the ground 50 ft from an obsever, If it rises vertically at the rate of 6 ft/s, how fast it receding from the point of obsevation when it is 120 ft above the ground?

A balloon leaves from a point P rises at a uniform speed. After 6 minutes, an observer situated at a distance of 450 sqrt""3 metres from point P observes that angle of elevation of the balloon is 60^(@) Assume that point of observation and point P are on the same level. What is the speed (in m/s) of the balloon?

A balloon leaves from a point P rises at a uniform speed. After 6 minutes, an observer situated at a distance of 450 sqrt3 metres from point P observes that angle of elevation of the balloon is 60^@ .Assume that point of observation and point P are on the same level. What is the speed (in m/s) of the balloon? एक मुब्बारा एक समान गति से बिन्दु P से छोड़ा जाता है। 6 मिनट पश्चात, बिन्दु P से 450 sqrt3 मीटर दूरी पर एक समीक्षक है जो देखता है कि गुब्बारे का उन्नयन कोण 60^@ है। मान लीजिए कि समीक्षा बिन्दु तथा बिन्दु P एक ही स्तर पर है। गुब्बारे की गति [मी/ से.में] क्या है?