Aworld's land speed record was set by colonel john p. stapp when in march 1954 he rode a rocket-propelled sled that moved along a track at 1020 km/h. he and the sled were brought to a stop in 1.40 s. in g units, what magnitude acceleration did he experience while stopping?

202.4 m/s²

Explanation:

a = acceleration experienced by him = ?

v₀ = initial speed of colonel = 1020 km/h = 283.33 m/s

t = time taken by him to come to a stop = 1.40 s

v = final speed of colonel after coming to a stop = 0 m/s

Based on the data we have, we can use the kinematics equation

v = v₀ + a t

0 =  283.33 + a (1.40)

a = - 202.4 m/s²

magnitude of acceleration is given as

a = 202.4 m/s²

atomic = no of protons.

mass number-atomic number = neutron number

i'm on my way to history not a mistory.