come to think of it..u r right madman.. the only possibility of the ball having velocity 0 when it meets the balloon is when it has already passed the balloon.. sorry 4 d mistake.. but i think ur soln is wrong.. "distance travelled in the next ts = 7.5t + 0.5*3t^2" from where did u get that 7.5 from??
"ut - 1/2 g t^2 = 75/2 + 15 t + 3/2 t^2 therefore 1/2 g t^2 = 75/2 -3/2 t^2"
how is this true??
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