50 m long trains are crossing each other in opposite direction with velocity of 10 m/s and 15 m/s. respectively Then time-taken by trains to cross each other will be-
Theif's car is moving with a speed of 10 m/s. A police van chasing this car with a speed of 5 m/s fires a bullet at the theif's car with muzzle velocity 72 km/h. Find the speed with which the bullet will hit the car, with respect to thief car-
A person standing on the floor of an elevator drops a coin. The coin reaches the floor of the elevator in a time t1 if the elevator is stationary and in time t2 if it is moving with constant velocity. Then-
A train in moving in the north at a speed 10 m/sec. Its length is 150 m. A parrot is flying parallel to the train in the south with a speed of 5m/s. The time taken by the parrot to cross the train will be-
Two cars are moving in the same direction with the same speed 30 km/hr. They are separated by a distance of 5 km, the speed of a car moving in the opposite direction if it meets these two cars at an interval of 4 minutes, will be-
A stone is thrown upwards from a tower with a velocity 50 ms¯¹. Another stone is simultaneously thrown downwards from the same location with a velocity 50 ms¯¹. When the first stone is at the highest point, the relative velocity of the second stone w.r.t. the first stone is (assume that second stone has not yet reachead the ground) :
A thief is running away on a straight road in a jeep moving with a speed of 9 m s¯¹. A police man chases him on a motor cycle moving at a speed of 10 m s¯¹. If the instantaneous separation of the jeep from the motorcycle is 100m, how long will it take for the police man to catch the thief?
A bus is moving with a velocity 10 ms¯¹ on a straight road. A scooterist wishes to overtake the bus in 100s. If, the bus is at a distance of 1 km from the scooterist, with what velocity should the scooterist chase the bus?
A 120 m long train is moving towards west with a speed of 10 m/s. A bird flying towards east with a speed of 5 m/s crosses the train. The time taken by the bird to cross the train will be –
A jet airplane travelling from east to west at a speed of 500 km h¯¹ejected out gases of combustion at a speed of 1500 km h ¯¹with respect to the jet plane. What is the velocity of the gases with respect to an observer on the ground ?
A stone is just released from the window of a train moving along a horizontal straight track. The stone will hit the ground in-
The motion of one projectile as seen from another will always
A traveller while in a uniformly moving train throws a ball up in the air. The ball will return-
A boat is moving with a velocity 3i + 4j with respect to ground. The water in the river is moving with a velocity – 3i – 4j with respect to ground. The relative velocity of the boat with respect to water is -
A ball is thrown from rear end of the compartment to the front end which is moving at constant horizontal velocity. An observer A sitting in the compartment and another observer B standing on the ground draw the trajectory. They will have-
An aeroplane is flying in a horizontal direction at 600 km/hr at a height of 6 km. and is advancing towards a point which is exactly over a target. At that instant the pilot releases a ball which on descending the earth strikes the target, the falling ball appears-
A bird is flying towards east with a velocity 40 km/hr and a train is moving with a velocity 40 km/hr towards east. A man in train drops a food packet. The path of food packet as seen by bird till it falls on ground is (ignore air resistance)
A body A is going from South to North and body B is going from West to East with identical velocity.Then direction of relative velocity of A with respect to B is-
The speed of a boat is 5 km/hr in still water. If it crosses a river of width 1 km along the shortest possible path in 15 min., then velocity of the river is-
A boat P is moving at 40 km/hr and another boat Q is moving at 20 km/hr. Which one of the following is not a possible value for their relative velocity-
