In a crash, a 60 kg passenger moving at 15 m/s must stop.

Step 1. (a) No: $60\ \text{kg} \times 15\ \text{m/s} = 900\ \text{kg m/s}$ either way.

Step 2. (b) The time of the stop.

Step 3. (c) Dashboard: $\dfrac{900\ \text{kg m/s}}{0.01\ \text{s}} = 90000\ \text{N}$. Airbag: $\dfrac{900\ \text{kg m/s}}{0.15\ \text{s}} = 6000\ \text{N}$.