(a) If a train traveling at `72 km//h` is to be brought to rest in a distance of `200 m`, find the deceleration.
(b) The velocity of a bullet is reduced from `200 m//s` to `100 m//s` while traveling through a wooden block of thickness `10 cm`. Find the retardation (assuming it ti be uniform).
A. `20 ms^(-2)`
B. `10 ms^(-2)`
C. `2 ms^(-2)`
D. `1 ms^(-2)`