KinematicsHard
Question
A river of width 200 m is flowing from west to east with a speed of $18\text{ }km/h$. A boat, moving with speed of $36\text{ }km/h$ in still water, is made to travel one-round trip (bank to bank of the river). Minimum time taken by the boat for this journey and also the displacement along the river bank is
$\_\_\_\_$ and $\_\_\_\_$ respectively.
Options
A.20 s and 100 m
B.40 s and 0 m
C.40 s and 200 m
D.40 s and 100 m
Solution
Minimum time :
$$t_{\text{min~}} = \frac{200}{10} = 20sec $$For round trip $= 40sec$.
Displacement along river bank $= 40 \times 5 = 200\text{ }m$
Create a free account to view solution
View Solution FreeMore Kinematics Questions
A parachutist drops freely from an aeroplane for 10s before the parachute opens out. then he descends with a net retarda...Two pulley arrangements of inure given are identical.The mass of the rope is highlighter. In fig (a), the mass m is lift...A bomb of mass 3.0kg explodes in air two pieces of masses of masses 2.0kg and 1.0 kg. The smaller mass goes at a speed o...A ball projected on smooth inclined plane in direction perpendicular to line of greatest slope with velocity of 8 m/ s. ...A cart of mass 0.5 kg is placed on a smooth surface and is connected by a string to a block of mass 0.2 kg. At the initi...