Question

A woman is wearing seatbelt while driving at 60 Km/Hour. She find it necessary to
slam on her brakes and she slows uniformly to stop in 1.6 s. What is the average
acceleration experienced by her.​

Answer 1

Answer:

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Explanation:

V =0 , U = 60 KM\HR , time = 1.6 sec

So, a = v - u / t = - 60/ 1.6 = -30 km/ hr2

Answer 2

Given : A women is wearing her seat belt, while driving at 60km/hr.

She finds it necessary to slam on her brakes and she slows

uniformly to a stop in 1.6 sec.

To Find :  the average acceleration experienced by her?

Solution:

u = 60 km/hr

= 60 * 1000 / 3600

= 50/3  m/s

a = ?

v = 0   as stops

t = 1.6 secs

v = u + at

=> 0 = 50/3  + a (1.6)

=> -50/3 = 1.6a

=> a = -50/(3 * 1.6)

=> a = - 50/4.8

=> a = -500/48

=> a = -125/12

=> a = -10.4167  m/s²

Finding in km/hr²

u = 60

v = 0

t = 1.6 secs  = 1.6/3600  hr

0 = 60 + a ( 1.6/3600)

=> a (1.6/3600) = - 60

=> a =  -60 * 3600 /1.6

=> a = 135000 km/hr²

=> a = 1.35 * 10⁵ km/hr²  

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