From a balloon rising vertically upwards at 5𝑚/𝑠 a stone is thrown up at 10 𝑚/𝑠 relative to the balloon. Its velocity with respect to ground after 2 𝑠 is (assume 𝑔 = 10𝑚/𝑠 2 )

Question : From a balloon rising vertically upwards at 5𝑚/𝑠 a stone is thrown up at 10 𝑚/𝑠 relative to the balloon. Its velocity with respect to ground after 2 𝑠 is (assume 𝑔 = 10𝑚/𝑠 2 )