1.

A ball is dropped from a balloon going up at a speed of 10m/s. If the balloon was at a height 75 m at the time of dropping the ball, how much time will the ball take in reaching the ground?​

Answer»

Initially BALL is GOING UPWARDS  Initial velocity=u= -7m/s S=60m a=g=10m/s2 From Second EQUATION of motion  s=ut+1/2at² 60= - 7t +(1/2 )10 t² 60=-7t +5t² 5t² -7t -60=0 t=-7±√49-4x5(-60)/2x5 t=-7±√49+1200/10 t=-7±35.3/10 t=7+35.3/10 =4.2 sec [ as t cannot be negative] ∴ The ball will take 4.2 sec to reach the groundExplanation:mark me as brainlist



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