You started to run at 10 km/h when you left your house and you arrived at school 30 minutes later. Assuming that your average acceleration was 30 km/h/h, how fast were you running when you arrived?

25km/h

Explanation:

this question involves the application of the first equation of motion

v=u+at

Where v= final velocity

u=initial velocity

a = acceleration

t= time

v=? u=10km/h t=30mins =0.5h (half an hour) a=30km/h/h

therefore, v= 10 + (30 ×0.5)

v=10 +15

v=25km/h

note that time was converted to h so that the units in the question would be uniform

12000j is work done

i think the answer is a and b

i wish you luck