Haley is driving down a straight highway at 73 mph. a construction sign warns that the speed limit will drop to 55 mph in 0.50 mi.
what constant acceleration (in m/s2) will bring haley to this lower speed in the distance available?

0.29

Explanation:

Given: Haley is driving down a straight highway at 73 mph. A construction sign warns that the speed limit will drop to 55 mph in 0.50 mi.

To Find: constant acceleration (in ) that will bring Haley to this lower speed in the distance available

Solution:

we know that,

mile=km

kmh =

Initial Speed of Haley(u)= mph

Final Speed of Haley(v)= mph

The distance to be travelled  while lowering the speed(S)= mile

                                      km

                                      m

according to third equation of motion,

as speed is lowering down the acceleration will be in the opposite direction of motion, hence acceleration will be negative, equation will become

putting values,

                     -=

                     a=

                     a≅

the constant acceleration that will drop speed to is

b.a device that inputs heat into a cool object

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.