1
AIPMT 2011 Mains
+4
-1
A particle covers half of its total distance with speed v1 and the rest half distance with speed v2. Its average speed during the complete journey is
A
$${{{v_1} + {v_2}} \over 2}$$
B
$${{{v_1}{v_2}} \over {{v_1} + {v_2}}}$$
C
$${{2{v_1}{v_2}} \over {{v_1} + {v_2}}}$$
D
$${{v_1^2v_2^2} \over {v_1^2 + v_2^2}}$$
2
AIPMT 2011 Prelims
+4
-1
A boy standing at the top of a tower of 20 m height drops a stone. Assuming g = 10 m s$$-$$2, the velocity with which it hits the ground is
A
10.0 m/s
B
20.0 m/s
C
40.0 m/s
D
5.0 m/s
3
AIPMT 2010 Prelims
+4
-1
A particle moves a distance x in time t according to equation x = (t + 5)$$-$$1. The acceleration of particle is proportional to
A
(velocity)3/2
B
(distance)2
C
(distance)$$-$$2
D
(velocity)2/3
4
AIPMT 2010 Prelims
+4
-1
A ball is dropped from a high rise platform at t = 0 starting from rest. After 6 seconds another ball is thrown downwards from the same platform with a speed v. The two balls meet at t = 18 s. What is the value of v?
(Take g = 10 m/s2)
A
75 m/s
B
55 m/s
C
40 m/s
D
60 m/s
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