please can anyone tell the solution
Q-14   Draw the graph between applied force and force of friction,representing the zone of static friction,limiting friction and kinetic friction.
Q -15.   Find a unit vector perpendicular to both the vectors A=3i +j+ 2k and B=2i -2J+ 4k
​Q -16.   A block of mass 0.05 kg when placed on a rough 15^o inclined plane slides down without acceleration .The inclination is then increased to 30^o .What would be the acceleration of block.g=9.8 m/sec².
Q -17.  A stone is thrown front the top of the tower at an angle of 30^o up with the horizontal with a velocity of 16 m/s .After 4 sec of light it strikes the ground. Calculate the height of the tower from ground and the horizontal range of the stone (g=9.8m/sec²) 
Q-18.  An automobile moving at a speed of 72 km/hr reaches the foot of a smooth inclined plane when the engine is switched off.How much distance does the automobile go up the incline before stopping ?The incline makes an angle of 30^o with horizontal (g=9.8 m/sec²).
Q-19.  prove that in an elastic collision in one dimension,the relative velocity of approach before impact is equal to the relative velocity of separation after collision.
Q-20.  Determine the acceleration a of the system and the tensions T₁ and T₂ in the strings.Assume that the table the pulleys are frictionless and the strings are massless.(g=9.8m/sec²).


Q -21   A light body and a heavy body have linear momentum, which one has greater K.E.
Q -22.  Show that in head on collision between two balls of equal masses moving along a straight line , the bells are simply exchange their velocity.
Q-23.   Two parallel rail lines are in the direction North and South .A train 'A' runs in north direction with a speed of 54 km/hr and another train 'B' runs in the south direction with speed of 90 km/hr .Find
(i)  The velocity of 'B' relative to 'A'
(ii)   Velocity of ground relative to 'B'
(iii)  Velocity of a monkey running on the roof of 'A' against its motion with a velocity of 18 km/hr relative to 'A' as observed by a man standing on the ground .
[Ans -144 km/hr,+90 km/hr ;36 km/hr]
Q -24  A particular performing uniform circular motion has angular momentum L.What will be the new angular momentum ,if the angular frequency is doubled and K.E. is halved ?
Q -25.  drive relation between torque and angular momentum.Also state law of conservation of angular momentum.Write the example based on it.
Q -26.  Three identical spheres ,each of radius R,are placed touching each other on horizontal table.