Hey all , just wanna ask u guys a qn from my exam , kinda forget
the whole part , so just a rough summary...
A boy is on a crane , and the crane accelerate from ground at 0.1m
per second square. The crane accelerate for 20seconds. The boy
dropped a stone down.
a)Find how high the boy is above the ground.
b)Find the time taken for the stone to drop to the ground.
Anyone knows? 
