A 400 kg rocket sled can be accelerated at a constant rate from rest to 1600 km/h in 2.0 s. What is the magnitude of the required net force?

Answer 1

F = M a

Calculate the acceleration, a, from the relation
Vfinal = a t

Vfinal = 444 m/s (You need to convert km/h to m/s)
a = 444/2 = 222 m/s^2

Answer 2

88800N