Solución

Apartado a

2(h2+6h+12)2\left( {{h^2} + 6h + 12} \right)

Apartado b

(i) 25   m/s25 \,\,\,m/s, (ii) 24.12   m/s24.12 \,\,\,m/s, (iii) 24.01   m/s24.01 \,\,\,m/s, (iv) 24   m/s24 \,\,\,m/s

Apartado c

24   m/s24 \,\,\,m/s