A boat travels 50 km east, then 120 km North and finally it comes back to the starting point through the shortest distance. The total time of journey is 3 h. What is the average velocity, in km h-1 over the entire trip ?
zero
100
17
33.33
A toy cyclist completes one round of a square track of side 2 m in 40 s. What will be the displacement at the end of 3 min ?
52 m
zero
16 m
Two trains, each of length 200 m are runmng on parallel tracks. One overtakes the other in 20 s and one crosses the other in 10 s. The velocities of the two trains are
5 m/s, 10 m/s
10 m/s, 30 m/s
15 m/s, 5 m/s
20 m/s, 21 m/s
A body starting from rest moves with constant acceleration. The ratio of distance covered by the body during the 5th second to that covered in 5 s is
The area under acceleration-time graph gives
distance travelled
change in acceleration
force acting
change in velocity
Two masses M and M/2 are joined together by means of light inextensible string passed over a frictionless pulley as shown in the figure. When the bigger mass is released, the small one will ascend with an acceleration of
g
The recoil velocity of a 4.0 kg rifle that shoots a 0.050 kg bullet at a speed of 280 ms-1 is
+ 3.5 ms-1
− 3.5 ms-1
A man of height h walks in a straight path towards a lamp post of height H with uniform velocity u. Then the velocity of the edge of the shadow on the ground will be
A train of 150 m length is going towards north direction at a speed of 10 ms-1. A parrot flies at a speed of 5 ms-1 towards south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to
12 s
8 s
15 s
10 s
An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically above a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is
1200 m
0.33 km
3.33 km
33 km