Question

Truck work rate is equal to 110,000 watts over 100m distance for 1 hr. Find for the truck mass. *
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Answer 1

Answer:

Work done W=ΔK.E=

2

1

m(v

2

2

−v

1

2

) ........(1)

Truck accelerates from v to 2v :

From (1), W=

2

1

m((2v)

2

−v

2

)=

2

3

mv

2

Truck accelerates from rest i.e. v

1

=0 to v :

From (1), W

a

=

2

1

m(v

2

−0)=

2

1

mv

2

⟹ W=3W

a

Hence option A is correct.

Explanation:

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