1
AIEEE 2008
+4
-1
An athlete in the olympic games covers a distance of $$100$$ $$m$$ in $$10$$ $$s.$$ His kinetic energy can be estimated to be in the range
A
$$200J-500J$$
B
$$2 \times {10^5}J - 3 \times {10^5}J$$
C
$$20,000J - 50,000J$$
D
$$2,000J - 5,000J$$
2
AIEEE 2007
+4
-1
A particle is projected at $$60^\circ$$ to the horizontal with a kinetic energy K. The kinetic energy at the highest point is
A
K/2
B
K
C
Zero
D
K/4
3
AIEEE 2007
+4
-1
A $$2$$ $$kg$$ block slides on a horizontal floor with a speed of $$4m/s.$$ It strikes a uncompressed spring, and compress it till the block is motionless. The kinetic friction force is $$15N$$ and spring constant is $$10, 000$$ $$N/m.$$ The spring compresses by
A
$$8.5cm$$
B
$$5.5cm$$
C
$$2.5cm$$
D
$$11.0cm$$
4
AIEEE 2006
+4
-1
A mass of $$M$$ $$kg$$ is suspended by a weightless string. The horizontal force that is required to displace it until the string makes an angle of $${45^ \circ }$$ with the initial vertical direction is
A
$$Mg\left( {\sqrt 2 + 1} \right)$$
B
$$Mg\sqrt 2$$
C
$${{Mg} \over {\sqrt 2 }}$$
D
$$Mg\left( {\sqrt 2 - 1} \right)$$
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