A particle of mass 2 mg moves with constant speed and is found to pass two points 5.0 m apart in a time interval of 5 ms. The kinetic energy of the particle is

A particle of mass 2 mg moves with constant speed and is found to pass

1.	A particle of mass 2 mg moves with constant speed and is found to pass two points 5.0 m apart in a time interval of 5 ms. The kinetic energy of the particle is
Answer» `1.0 J` `2.0 J` `3.0 J` `4.0 J` SOLUTION :Mass of the PARTICLE, `m = 2 mg = 2 xx 10^(-6) kg` Particle is moving with constant speed, so Speed, v = `("distance between TWO points")/("time interval") = (5m)/(5 xx 10^(-3) s) = 10^3 ms^(-1)` `:.` KE = 1/2 mv^2 = 1/2 (2 xx 10^(-6))(10^(3))^(2) = 1J`