Question

1:
a change in velocity?
Section 4.4
7. What is the acceleration of a car moving
along a straight-line path that increases its
speed from zero to 100 km/h in 10 s?
S
1
2

Answer 1

• Initial velocity=u=0m/s
• Final velocity=100km/h=v=100×5/18=500/18=2.7m/s
• Time=t=10s

$\\ \tt\longmapsto Acceleration=\dfrac{v-u}{t}$

$\\ \tt\longmapsto Acceleration=\dfrac{2.7-0}{2}$

$\\ \tt\longmapsto Acceleration=\dfrac{2.7}{10}$

$\\ \tt\longmapsto Acceleration=27m/s^2$

Answer 2

Answer:

• Initial velocity=u=0m/s

• Final velocity=100km/h=v=100×5/18=500/18=2.7m/s

• Time=t=10s

⟼Acceleration=tv−u

⟼Acceleration=22.7−0

⟼Acceleration=102.7

⟼Acceleration=27m/s2