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Question

A 500 kg rocket can be accelerated at a constant rate from rest to 1800 km/h in 2 sec. The magnitude of the required net force is .

A
450,000 N
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B
12,000 N
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C
125,000 N
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D
18,00,000 N
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Solution

The correct option is C 125,000 N

As we know,

F=ΔpΔt

ΔP=m(vu)=500v

v = 1800 km/hr

= 180010003600m/s

= 500 m/s

ΔP=500(5000)

= 250,000 kg m/s

F=250,0002=125,000N

Fnet=125,000N


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