1
AIPMT 2007
+4
-1
A vertical spring with force constant k is fixed on a table. A ball of mass m at a height h above the free upper end of the spring falls vertically on the spring so that the spring is compressed by a distance d. The net work done in the process is
A
mg(h + d) $$-$$ $${1 \over 2}$$kd2
B
mg(h $$-$$ d) $$-$$ $${1 \over 2}$$kd2
C
mg(h $$-$$ d) + $${1 \over 2}$$kd2
D
mg(h + d) + $${1 \over 2}$$kd2
2
AIPMT 2006
+4
-1
300 J of work is done in sliding a 2 kg block up an inclined plane of height 10 m. Work done against friction is (Take g = 10 m/s2)
A
1000 J
B
200 J
C
100 J
D
zero
3
AIPMT 2006
+4
-1
The potential energy of a long spring when stretched by 2 cm is U. If the spring is stretched by 8 cm the potential energy stored in it is
A
U/4
B
4U
C
8U
D
16U
4
AIPMT 2006
+4
-1
A body of mass 3 kg is under a constant force which causes a displacement s in metres in it, given by the relation s = $${1 \over 3}$$t2, where t is in seconds. Work done by the force in 2 seconds is
A
$${{19} \over 5}J$$
B
$${5 \over {19}}J$$
C
$${3 \over {8}}J$$
D
$${8 \over {3}}J$$
EXAM MAP
Medical
NEET