Question

a car starts from rest and acquire velocity of 54km/h in 2 sec find the accelerstion
ii) if the mass of the car is 1000kg what is the force acting on it?​

Answer 1

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Answer 2

AnswEr:-

(1)  

As the car is starting from rest ,

Initial velocity = u = 0 m/s

Final velocity = v = 54 km/hr

convert km/hr to m/s :

=> Final velocity = v = 54 km/hr = 54 x 5/18

= 15 m/s

=> Time = t = 2 sec

From Equation of motion :

• v = u + at

=> 15 = 0 + 2a

=> a = 15/2 = 7.5 m/s²

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(2)  Given that ,

          mass = 1000 kg

           force = ?

we know,

•      F = ma

=>  F = 1000 * 75/10

=> F = 7500 N .

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