Work, Energy & Power · JEE Main previous year questions

2002 3 questions

1. Q742002 · 27 Apr 2002 · Shift 1

   A ball whose kinetic energy is E, is projected at an angle of $45^{\circ }$ to the horizontal. The kinetic energy of the ball at the highest point of its flight will be

   1. A.E
   2. B.$\frac{E}{\sqrt{2}}$
   3. C.$\frac{E}{2}$
   4. D.zero
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   Answer: C

2. Q892002 · 27 Apr 2002 · Shift 1

   The kinetic energy needed to project a body of mass $m$ from the earth surface (radius $R$) to infinity is

   1. A.$mgR/2$
   2. B.$2mgR$
   3. C.$mgR$
   4. D.$mgR/4$
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   Answer: C

3. Q932002 · 27 Apr 2002 · Shift 1

   A spring of force constant $800N/m$ has an extension of $5\mathrm{cm}$. The work done in extending it from $5\mathrm{cm}$ to $15\mathrm{cm}$ is

   1. A.$16\mathrm{J}$
   2. B.$8\mathrm{J}$
   3. C.$32\mathrm{J}$
   4. D.$24\mathrm{J}$
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   Answer: B