Question

With an initial velocity of 20 km/h, a car accelerated at 8 m/s2
for 10 seconds.

what is the velocity of the car at the end of ten seconds

Answer 1

Explanation:

u= 20km/h = 20*5/18 = 100/18 m/s

a = 8m/s²

t = 10s

v = at+u

$= 8 \times 10 + \frac{100}{18} \\ = 80 + \frac{100}{18} \\ = 80 + 5.56 \\ = 85.56$

v = 85.56m/s

Answer 2

Answer:

final velocity (x) = 1992

Explanation:

initial velocity= 20 km/h

final velocity = x

time=10 secs

acceleration =8m/s²

intial velocity (km/h) =m/s²

20km/h = 20,000m/s²

formula: a=v-u/t

8=x-20,000/10s

(transposing)

x=20,000 - 8

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10

x= 20,000-80/10

x=19,920/10

x=1,992