By careful observation of the table shown:
Average change in velocity without seatbelt, △v = 15.14 m/s
Average change in time without seatbelt, △t = 0.1034s
Average force of impact without seatbelt = 11549.78N
The average acceleration of the car without seatbelt = △v/△t
The average acceleration of the car without seatbelt = 15.14/0.1034
The average acceleration of the car without seatbelt = 146.42 m/s²
Average change in velocity with seatbelt, △v = 15.06 m/s
Average change in time with seatbelt, △t = 0.1184s
Average force of impact with seatbelt = 9961.54N
The average acceleration of the car with seatbelt = △v/△t
The average acceleration of the car with seatbelt = 15.06/0.1184
The average acceleration of the car without seatbelt = 126.2 m/s²
We would observe that:
• The acceleration of the vehicle after crash when seatbelt was not used is greater than the acceleration of the vehicle after crash when seatbelt was used
• The force of impact without seatbelt is greater than the force of impact with seatbelt
During a slow motion replay of each crash, we expect to see a more fatal crash when seatbelt was not used because of the high force of impact
The videos of the crash with and without seatbelts will be different in their forces of impact on the vehicle.