10 কেজি ভরের একটি বডি 20 ms^(-1) বেগে চলে যাচ্ছে। শরীরের ভর দ্বিগুণ হলে...

A body moves in the southern direction for 10 s at the speed of 10 ms^(-1) . It then starts moving in the eastern direction at the speed of 20 ms^(-1) for 10 s , The magnitude of the average velocity is …………………………, The averge speed is ……………………., The total displacement will be .....................,

An object is moving with uniform acceleration. Its velocity after 4s is 20 ms^(-1) and after 7 second is 29 ms"^(-1) . Find the distanc etravelled by the object in 10 th second.

A cubical block (of side 2 m ) of mass 20 kg slides on inclined plane lubricated with the oil of viscosity eta=10^(-1) with constant velocity of 10 ms^(-1) . Find out the thickness of the layer of liquid (take g = 10 ms^(-2) ).

A train of mass 2xx10^(5) kg has a constant speed of 20 ms^(-1) up a hill inclined at theta=sin^(-1)((1)/(50)) to the horizontal when the engine is working at 8xx10^(5) W. Find the resistance to motion of the trian. (Take ,g=9.8 ms^(-2) ).

A man holds an umbrella at 30^@ with the vertical to keep himself dry. He, then, runs at a speed of 10ms^(-1) , and find the rain drops to be hitting vertically. Study the following statement and find the correct options. i. Velocity of rain w.r.t. Earth is 20 ms^(-1) ii. Velocity of rain w.r.t. man is 10 sqrt(3)ms^(-1) . iii. Velocity of rain w.r.t. Earth is 30 ms^(-1) iv. Velocity of rain w.r. t. man is 10sqrt(2) ms^(-1) .

Two trains are moving with velocities v_1 = 10 ms^-1 and v_2 = 20 ms^-1 on the same track in opposite directions. After the application of brakes if their retarding rates are a_1 = 2 ms^-2 and a_2 = 1 ms^-2 respectively, then the minimum distance of separation between the trains to avoid collision is

A body moves at a speed of 100 ms^(-1) for 10 s and then moves at a speed of 200 m s^(-1) for 20 s along the same direction. The average speed is …………………………….,

Starting from a stationary position, Sunil moves his car to attain a velocity of 20ms^(-1) in 10s. Find the acceleration of the car.

Water flow througyh a horizontal pipe whose internal diameter is 2.0 cm at a speed of 1.0 ms^(-1) What should be the diameter of the nozzle, If the water is to emerge at a speed of 4.0ms^(-1) ?