1. The height of a dolphin relative to sea level, $h$ cm, $t$ seconds after it begins a jump from sea level is modelled by the equation

$h=A\text{sin}(Bt)t\geq0$

where $A$ and $B$ are constants.

Given that, according to the model,

• on each jump the dolphin reaches a maximum height of exactly 70 cm above sea level

• on each dive the dolphin reaches a maximum depth of exactly 70 cm below sea level,

write down the value of $A$.