Motion Test - 7...

A body of mass 5 kg having a velocity of 80 $$ms^{-1}$$  experiences a force in the opposite direction. The body is brought to rest in 8 sec. What is the retardation produced by the force? 

A body starting with initial velocity $$u$$ comes back to the starting point in $$t$$ seconds. Then the acceleration is

A particle is released from rest from a tower of height $$3h$$ The ratio of time taken to fall equal heights $$h , t _ { 1 } : t _ { 2 } : t _ { 3 }$$ is 

A car accelerates uniformly from $$18 km/h$$ to $$36 km/h$$ in $$5s$$.  The distance covered by the car will be 

A conveyor belt is moving horizontally at a speed of $$4 \ m/sec$$ with a box of mass $$20 \ kg$$ on it. The box suddenly drops off the conveyer belt to the ground and it takes $$0.1 \ second$$  for the box to come to rest. Considering the height of the conveyer belt to be negligible, the distance moved by the box in the conveyor belt is:

In a damped oscillator, the mass of the oscillator is m = 200g, force constant is K = 90N/m and the damping constant b is 40 g/s. Find the time taken for its mecharical energy to drop to half its initial value 

A ship moves at 40 km/h due north and suddenly moves towards east through $$9\mathring { 0 } $$ and continuous to move with the same speed. Then the change in its velocity is 

A particle moves with constant acceleration for 6 seconds after starting from rest. The distance travelled during the first three consecutive 1 seconds interval is in the ratio?

A body moving with constant acceleration covers 24 m in the $$4^{th}$$ second and 36 m in the $$6^{th}$$ second. The initial velocity of the body is 

A block of weight $$4 kg$$ is resting on a smooth horizontal plane. If it is struck by a jet of water at the rate of $$2 kg/s$$ and at the speed of $$10 m/s$$, then the initial acceleration of the block is