4. It takes a car one minute to go from rest
to 30 m/s east. What is the acceleration of
this car

0.5m/s2

Explanation:

Data obtained from the question include:

u (initial velocity) = 0m/s

v (final velocity) = 30m/s

t (time) = 1min = 60secs

a (Acceleration) =?

a = v — u/t

a = 30—0 / 60

a = 30/60

a = 0.5m/s2

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.