According to Newton's first law of motion, a body moving with a uniform speed along a stright line should continue moving. In practice, a body in motion stops after some time. Explain the reason.

A car moving along a straight line at a speed of 72km/h stops in 5s. After the brakes are applied. Find the acceleration

Force on a charge in electric and magnetic fields A charge particle follows a parabolic path in a uniform electric field and a charged particel moving in a uniform magnetic field has two kinds of motions lnear motion in the direction of magnetic field and circular motion in a plane perpendicular to the magnetic field. when charge q is moving perpendicular to the magnetic field B, the radius of the circular path is r=(mv)/(Bq) . If v and B makes an angle theta , then r=(mvsintheta)/(Bq) , and the time period T=(2pim)/(Bq) . Under the influenece of a uniform magnetic field, a charged particles is moving in a circle of radius r with speed v. The time period of motion.

A body is imparted motion from rest of move in straight line. If it is then obstructed, by an opposite force, then:

A body starts from rest and moving with uniform acceeration of 4 m//s^2 covers half of its total path during the last second of its motion. Find the itme taken and the total distance covered.

Under the influence of a uniform magnetic field, a charged partile is moving in a circle of radius R with constant speed v. The time period of motion