Question

a car advertisement States that a certain car can accelerate from rest to70km/h in 7seconds find the car's average acceleration​

Answer 1

Acceleration is 2.78 m/s²

Step-by-step explanation:

Since the car is from rest, initial velocity, u is zero.

from first newton's equation of motion:

`{ \bf{v = u + at}} \\`

v is final velocity

u is initial velocity

a is acceleration

t is time

70 km/h is (70 × 1000 ÷ 3600) m/s = 19.44 m/s

`{ \sf{19.44 = 0 + (a * 7)}} \\ { \sf{7a = 19.44 }} \\ { \sf{a = 2.78 \: {ms}^( - 2) }}`