Question

A car of mass 2000kg is moving with speed 108km/h,when brake applies suddenly it stops after travelling a distance of 15 m .Find the work done on a wheel of a car​

Answer 1

Answer:

Given,

Mass:2000kg

u: 108 km/hr

108 × 5/18

30m/s

v: 0 km/hr

s: 15m

W = F × S,

so, we have to find FORCE:

F = M×A

SO, we have to find a (acceleration):

2as = v²-u²

2a × 15 = (0)²- (30)²

30a = (30)²

a = (-30×-30)/30

_______

a = 30

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So,

F = M × a

F = 2000 × (30)

F = 60000

now,

W= F×S

W= 60000 × 15

_______________

W= 900000 J

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