An object of mass, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest?

Expression for kinetic energy  Ek= ½ mv2  m = Mass of object  v = Velocity of the object in ms−1  Given that kinetic energy, Ek=25J  (i) If the velocity of an object is doubled, then...

Mass of the body = 20 kg  Initial velocity = 5 m/s  Final velocity = 2 m/s  We know that , Work done = change in kinetic energy = 1/2 mu2 - 1/2 mv2 = 1/2...

Mass of the car m = 1500 kg  Velocity of the car v = 60 km/h  = 60×1000 /60×60 = 50 /3 m/s The car is in motion, so its energy = kinetic...

When force applied on a body causes the body to move then the work is said to be done by the force.  Positive work done: when the body is displaced in...

Coolie is carrying a load on his head so force exerted by it under gravity and displacement of the load makes 900 angle.  W = 0           ...

Initial difference in height = (150 – 100) m = 50 m  Distance travelled by first body in 2 s = h1 = 0 + 1/ 2 g (2)2 = 2...

(d) > 500N for time Δt1 and Δt3 and 500N for Δt2. Explanation:  During the constant velocity for time Δt2 there is no relative movement between the man and the seat and only force applied by the seat on...

The correct answer is (c) CA > CB

(a) Both the frames are inertial. (b) Both the frames are noninertial. Explanation: S1 is moving with constant velocity w.r.t frame S2 . So, if S1 is inertial, then S2 will be inertial...

(a) the force is always perpendicular to its velocity (c) the object is stationary but the point of application of the force moves on the object (d) the object moves in such...