What is the speed of a lion that sprints 80 m in 4 s?

What is the speed of a transverse wave in a rope of length 10 m and mass 80 gm under a tension of 80 N?

The speeds of ten particles are ( in m//s ) 6.00, 5.00, 8.00, 10.0, 10.0, 14.0, 14.0, 18.0, and 20.0 m//s (i) What is the average speed, (ii) What is the rms speed and (iii) What is the most probable speed of the particles?

In the figure shown below, a fluid of density 2 xx 10^(3) kg m^(-3) is flowing in a horizontal pipe. The speed of water at point A is 4 cm s^(-1) , what is its speed at point B?

In the figure, the pulley P moves to the right with a constant speed of 4 m//s . The downward speed of A is v_(A) = 3 m//s . Then find the speed of B of the right (in m//s ).

A man travels 200 km distance with the speed of 40 m/s and next 50 km with the speed of 10 m/s . Find the average speed of man.

A particle of mass 1 kg is thrown vertically upward with speed 100 m/s. After 5 sec it explodes into two parts. One part of mass 400 g comes back with speed 25 m/s, what is-the speed of the other part just after explosion? (g= 10 m//s^(2) )

A particle of mass 1 kg is thrown vertically upwards with speed 100 m/s. After 5 s, it explodes into two parts. One part of mass 300 g comes back with speed 24 m/s, What is the speed of other part just after explosion? (a) 100 m/s upwards (b) 600 m/s upwards (c) 600 m/s upwards (d)81.7 m/s upwards

A person walking at 4 m/s finds rain drops falling slantwise into his face with a speed of 4 m/s at an angle of 30^(@) with the vertical . Show that the actual speed of the rain drops is 4 m/s .

A shell of mass 0.020 kg is fired by a gun of mass 100 kg. If the speed of the shell is 80 m/s , the recoil speed of the gun would be

A man of mass 80 kg is riding on a small cart of mass 40 kg which is rolling along a level floor at a speed 2 m/s . He is running on the cart , so that his velocity relative to the cart is 3 m/s in the direction opposite to the motion of cart . What is the speed of the centre of the mass of the system ?