1. The problem statement, all variables and given/known data A cricket ball is thrown vertically upwards and returns in 4.2s. Find (a)The initial velocity of the ball (b)The maximum height reached 2. Relevant equations v=u+at v^2=u^2+2as s=(u+v)/2 multiplied by t s=ut+1/2at^2 3. The attempt at a solution s=? u=? v=? a=9.81ms^-2 (negative travelling upwards) t=4.2s I could not start the question because to use SUVAT equations at least 3 of the 5 letters must have values to be put into a equation.