Question

A car start from rest and acquire a velocity of 18 km/h in 2 sec. Find (i) the acceleration (ii) distance travelled by the car

Answer 1

Answer:

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Step-by-step explanation:

As the car is starting from the rest,

Initial velocity= u = 0 m/s

Final velocity= v= 54 km/h

To convert km/h to m/s, we multiply it by 5/18 .

Final velocity= v= 54 km/h = 54 × 5/18

= 15 m/s

Time= t= 2 sec

a= acceleration

Equation of motion : v= u+ at

15 = 0 + 2a

a= 15/2 = 7.5 m/s ^2 (Square)

s= Distance travelled

Equation of motion :

s= ut + 1/2 at ^2 (Square)

= 0+ 1/2 × 7.5× 2^2 (square)

= 15 meters .