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The unit of retardation is ms^(-2)....

The unit of retardation is `ms^(-2).`

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The mass of a car is 1200 kg. It comes to rest due to retardation of 2 ms^(-2) . What would be the force (frictional force) acting between the car and road ?

What is retardation ?

A driver of train A, moving at a speed 30 ms^(-1), sights another train B going on the same track and in the same direction with speed 10 ms^(-1). He immediately applies brake that gives his train a constant retardation of 2 ms^(-2). What must be the minimum distance between trains in order to avoid a collision ?

A parachutist drops first freely from a plane for 10 s and then his parachute opens out. Now he descends with a net retardation of 2.5 ms^(-2) If he bail out of the plane at a height of 2495 m and g=10 ms^(-2) , his velocity on reaching the ground will be .

The SI unit of energy is J=kg m^(2)s^(-2) , that of speed v is ms^(-1) and of acceleration a is ms^(-2) . What of the formulae for kinetic energy (k) given below can you rule out on the basis of dimensional arguments (m stands for the mass of the body) : (a) K = m^(2)v^(2) (b) K = (1/2)mv^(2) ("c") K= ma (d) K = (3/16)mv^(2) (e) K=(1/2)mv^(2)+ma

What will be distance covered byu vehicle after applying breakes with retardation 8 m//s ^(2) if its velocity is 72 km/h ?

A particle is thrown upwards from ground. It experiences a constant resistance force which can produce a retardation of 2 ms^-2. The ratio of time of ascent to time of descent 13 ( g = 10 ms^-2 )

What will be distance covered by vehicle after applying brakes with retardation 2m //s^(2) if its velocity is 1.8 km//h ?

KUMAR PRAKASHAN-MOTION -TRUE OR FALSE
  1. A train travels with speed 40 km h^(-1) for first 15 minutes and then...

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  2. The slope of the distance-time (xt) graph gives the magnitude of accel...

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  3. The unit of retardation is ms^(-2).

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  4. The direction of acceleration of an object performing uniform circular...

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  5. If the final velocity of an object is less than the initial velocity, ...

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  6. The SI unit of speed is km h ^(-1).

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  7. Motion is a relative concept.

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  8. For both the distance and displacement SI unit is metre.

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  9. The magnitude of the displacement of an object is 20 m, then it can be...

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  10. The distance covered by an object in the given time duration may be po...

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  11. The displacement of an object in a given time interval may be zero.

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  12. Average speed is an average of different speeds.

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  13. An object performs motion with constant speed along a circular path, t...

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  14. An object performing uniform circular motion performs accelerated moti...

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  15. An object had covered 120 km distance, half of this distance was cover...

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  16. A train travels with speed 40 km h^(-1) for first 15 minutes and then...

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  17. The slope of the distance-time (xt) graph gives the magnitude of accel...

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  18. The unit of retardation is ms^(-2).

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  19. The direction of acceleration of an object performing uniform circular...

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  20. If the final velocity of an object is less than the initial velocity, ...

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