E $1\mathrm{.}2$

A ball which is $7,2m$ above.

is thrown vertically upwards with speet of $5\frac{m}{s}.$ Calculate$=$

a$)$ The speed of ball when it hits the ground and tine $(V_A,t_A)$

b$)$ The speed of ball when it is at height,$+C$ of $4\mathrm{.}4m$ on ground $?)$

c$)$ The highest position of ball $($hmax $=?)$Example $1($Concrete mix design$)$

Given:

Portland cement $)$

Aggregate : mixture of sand & sandy gravel

$\backslash$table$[[$Sieve size $(mm),0\mathrm{.}25,0\mathrm{.}50,1,2,4,8,16,$