A boat is moving with velocity of in river and water is moving with a velocity of with respect to ground. Relative velocity of boat with respect to water is :
The relative velocity of boat w.r.t. water
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A boat is moving with velocity of in river and water is moving with a velocity of with respect to ground. Relative velocity of boat with respect to water is :
The relative velocity of boat w.r.t. water
The distance between two particles is decreasing at the rate of 6 m/sec. If these particles travel with same initial speeds and in the same direction, then the separation increases at the rate of 4 m/sec. The particles have speeds as
When two particles moves towards each other then ...(i)
When these particles moves in the same direction then ...(ii)
By solving and
An express train is moving with a velocity v1. Its driver finds another train is moving on the same track in the same direction with velocity v2. To escape collision, driver applies a retardation a on the train. The minimum time of escaping collision will be
As the trains are moving in the same direction. So the initial relative speed and by applying retardation final relative speed becomes zero.
From ⇒ ⇒
A stone falls from a balloon that is descending at a uniform rate of 12 m/s. The displacement of the stone from the point of release after 10 sec is
, ,
Displacement
A ball is dropped on the floor from a height of 10 m. It rebounds to a height of 2.5 m. If the ball is in contact with the floor for 0.01 sec, the average acceleration during contact is
Velocity at the time of striking the floor,
Velocity with which it rebounds.
∴ Change in velocity
∴ Acceleration (upwards)
A body A is projected upwards with a velocity of 98 m/s. The second body B is projected upwards with the same initial velocity but after 4 sec. Both the bodies will meet after
Let t be the time of flight of the first body after meeting, then sec will be the time of flight of the second body. Since
∴
On solving, we get seconds
Two bodies of different masses ma and mb are dropped from two different heights a and b. The ratio of the time taken by the two to cover these distances are
A body falls freely from rest. It covers as much distance in the last second of its motion as covered in the first three seconds. The body has fallen for a time of
A stone is dropped into water from a bridge 44.1 m above the water. Another stone is thrown vertically downward 1 sec later. Both strike the water simultaneously. What was the initial speed of the second stone ?
Time taken by first stone to reach the water surface from the bridge be t, then
Second stone is thrown 1 sec later and both strikes simultaneously. This means that the time left for second stone
Hence
A body is thrown vertically upwards. If air resistance is to be taken into account, then the time during which the body rises is
Let the initial velocity of ball be u
Time of rise and height reached
Time of fall is given by
∴ because
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