During a test crash, a 1,450kg sedan accelerates from rest at a constant acceleration of 5m/s^2 for 20m until it collides with a concrete wall. What
is the change in kinetic energy when the car strikes the wall and comes to
a stop?

at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000