Question

An object is thrown vertically upwards and raise to a height of 20 m. calculate 1) the velocity with which the object was thrown upwards. 2) The time taken by the object to reach the highest point.

Answer 1

given that ,
 h= 20m

u=√2gh
  =√ 2 x 10 x 20
 =√400
=20
∴u = 20m/s
 t = u/g
  = 20/10
 = 2
∴t = 2s
 
I hope answers are correct

Answer 2

time taken by it is 2 sec it is very easy
hope i am correct