The x-t plot shown in the figure below describes the motion of the particle, along x-axis, between two positions A and B. The particle passes through two intermediate points P1 and P2 as shown in the figure
The instantaneous velocity is positive as P1 and negative at P2.
The instantaneous velocity is negative at both P1 and P2
The instantaneous velocity is negative at P1 and positive at P2
The instantaneous velocity is positive at both P1 and P2
A man rides a bicycle with a speed of 17.32 ms-1 East- West direction. If the rain falls vertically with a speed of 10 ms-1, then the direction in which he must hold his umbrella is
30° with the vertical towards East
60° with the vertical towards West
30° with the vertical towards West
60° with the vertical towards East
From a balloon moving upwards with a velocity of12 ms-1, a packet is released when it is at a height of 65 m from the ground. The time taken by it to reach the ground is (take, g = 10 ms-2)
5 s
8 s
4 s
7 s
A bus is moving with a velocity of 10 ms-1 on a straight road. A scootorist wishes to overtake the bus in one minute. If the bus is at a distance of 1.2 km ahead, then the velocity with which he has to chase the bus is
20 ms-1
25 ms-1
30 ms-1
40 ms-1
If the displacement of a body varies as the square of elapsed time, then its
velocity is constant
velocity varies non-uniformly
acceleration is constant
acceleration changes continuously
C.
acceleration is constant
If the displacement of a body varies as the square of elapsed time, then its acceleration is constant.
i,e
A ball dropped from a point A falls down vertically to C, through the mid-point B. The descending time from A to B and that from A to C are in the ratio
1 : 1
1 : 2
1 : 3
The time required to stop a car of mass 800 kg, moving at a speed of 20ms-1 over a distance of 25 m is
2 s
2.5 s
4 s
4.5 s
The ratio of distance traversed in successive intervals of time when a body falls freely under gravity from certain height is
1 : 2 : 3
1 : 5 : 9
1 : 3 : 5