A1400-kg car moving with a speed of 32 m/s is approaching a stoplight. the light turns yellow and the car makes an abrupt stop over a distance of 60 meters. the amount of work done on the car approximately.

a. 84,00 j
b. 268, 800 j
c. 716, 800 j
d. 840,000 j
e. 2, 688,000 j
f. none of these are correct.

c. 716, 800 J

Explanation:

t = Time taken

u = Initial velocity = 32 m/s

v = Final velocity = 0

s = Displacement = 60 m

a = Acceleration

m = Mass of car = 1400 kg

Work done is given by

The amount of work done to stop the car is 716800 J

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .

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.