1
JEE Main 2017 (Offline)
+4
-1
A time dependent force F = 6t acts on a particle of mass 1 kg. If the particle starts from rest, the work done by the force during the first 1 sec. will be:
A
18 J
B
4.5 J
C
22 J
D
9 J
2
JEE Main 2017 (Offline)
+4
-1
A body of mass m = 10–2 kg is moving in a medium and experiences a frictional force F = –kv2. Its initial speed is v0 = 10 ms–1. If, after 10 s, its energy is $${1 \over 8}mv_0^2$$, the value of k will be:
A
10-1 kg m-1 s-1
B
10-3 kg m-1
C
10-3 kg s-1
D
10-4 kg m-1
3
JEE Main 2016 (Online) 10th April Morning Slot
+4
-1
A particle of mass M is moving in a circle of fixed radius R in such a way that its centripetal acceleration at time t is given by n2 R t2 where n is a constant. The power delivered to the particle by the force acting on it, is :
A
M n2 R2 t
B
M n R2 t
C
M n R2 t2
D
$${1 \over 2}$$ M n2 R2 t2
4
JEE Main 2016 (Online) 10th April Morning Slot
+4
-1
Velocity-time graph for a body of mass 10 kg is shown in figure. Work-done on the body in first two seconds of the motion is :

A
12000 J
B
$$-$$ 12000 J
C
$$-$$ 4500 J
D
$$-$$ 9300 J
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