Question

A car is travelling 75.0 km/hr on a highway, then encounters bad weather. Over a 0.5 hour time period the driver slows down to 50.0 km/hr. Calculate the acceleration of the car.

PLEASE HELP

Answer 1

\[v=v_{0}+at\]So\[a=\frac{ v-v_{0}}{ t }\]

Answer 2

initial velocity\[ \nu _{0}=75.0km/h\]
and final velocity \[\nu=50km/h\]
t=0.5 h
hence by using above formula given by Anonymous1921
\[a=\frac{ (50-75) }{ 0.5 }\]
\[a=-50km/s ^{2}\]
Acceleration is negative, because car has slowed down i.e. velocity has decreased.