What is the deceleration (in m/s2) of a rocket sled if it comes to rest in 1.7 s from a speed of 1020 km/h? (Such deceleration caused one test subject to black out and have temporary blindness.)

40.47m/s²

Explanation:

Acceleration is the change in velocity of a body with respect to time.

Acceleration = change in velocity/time

Given speed = 1020km/hr

Time = 1.7s

Converting 1020km/hr to m/s we have;

(1020*1000/3600) m/s

= 1,020,000/3,600

= 283.3m/s

Acceleration = 283.3/7

Acceleration = 40.47m/s²

Deceleration is therefore 40.47m/s²