Although the question is missing, with the provided information you can find the impact (impulse), the change of momentum, the force and the acceleration.
Data:
mass, m = 70 kg
velocity, v = 175 km/h = 175 km * 1000 m/km * 1 h / 3600 s = 48.61 m/s
time, t = 0.027 s
Impact = F * t = m * a * t = m * Δv = change of momentum
=> Impact = change of momentum = 70 kg * 48.61 m/s = 3402.7 N*s
Force, F:
Impact = F * t => F = impact / t = 3402.7 N*s / 0.027 s = 126,025.9 N
Acceleration, a:
F = m * a => a = F / m = 126,025.9 N / 70 kg = 1800 m/s^2