Laws of Motion ...

A body of mass 2 kg is moving on the ground comes to rest after some time. The coefficient of kinetic friction between the body and the ground is 0.2. The retardation in the body is

A block of mass m is in contact with the cart C as shown in the figure.The coefficient of static friction between the block and the cart is µ. The acceleration α of the cart that will prevent the block from falling satisfies

A boy presses a book against the front wall such that the book does not move. The force of friction between the wall and the book is

A horse rider falls back when horse starts runningsuddenly because

When a train stops suddenly, passengers in the running train feel an instant jerk in the forward direction because

A man getting down a running bus falls forwardbecause

A boy sitting on the topmost berth in a compartment of a train which is just going to stop on a railway station, drops an apple aiming at the open hand of his brother sitting vertically below his hands at a distance of about 2 m. The apple will fall

A person sitting in an open car moving at constant velocity throws a ball vertically up into air. The ballfalls

A small block of mass of 0.1 kg lies on a fixed inclined plane PQ which makes an angle θ with the horizontal. A horizontal force of 1 N acts on the block through its centre of mass as shown in the figure. The block remains stationary if (take g = 10 m/s²)

A small block is connected to one end of a massless spring of un-stretched length 4.9 m. The other end of the spring (see the figure) is fixed. The system lies on a horizontal frictionless surface. The block is stretched by 0.2 m and released from rest at t = 0. It then executes simple harmonic motion with angular frequency ω = π /3 rad/s. simultaneously at t = 0, a small pebble is projected with speed v from point P at an angle of 45° as shown in the figure. Point P is at a horizontal distance of 10 m from O. If the pebble hits the block at t =1 s, the value of v is (Take g = 10 in/s²)