Question Number 91446 by mr W last updated on 30/Apr/20
Commented by mr W last updated on 30/Apr/20
$${a}\:{ball}\:{is}\:{dropped}\:{from}\:{point}\:{A}\:{and} \\ $$$${hits}\:{the}\:{ground}\:{at}\:{point}\:{B}\:{as}\:{shown}. \\ $$$${find}\:{a}=?. \\ $$