[1] A stone thrown upwards attains a maximum height of 39.2 m. find the velocity which it was thrown

ans. 14 m/s

[2] A ball is thrown upwards with a speed of 19.6 m/s. Calculate [a] the maximum height it reaches , and [b] the time taken in reaching the maximum height [c] time to return its original position

ans. [a] 19.6 m [b] 2 s [c[ 4 s

pls say the method