Mechanics | Relativity Answers

what is wrong with the statement "Because the car is at rest, there are no forces acting on it"? how would you correct this sentence?

a ball is projected from the ground with a spped of 25m\s two sec later it just clear a wall of 5m high.find the angle of projection,max height. how far beyond the ballagain till the ground?

a batter hits a ball so that it lifts the bat at speed of 30 m\s at angle 53.1 degree.find the position and velocity of ball at T=2 sec

a canon fires sucessively two shells with a velocity 240 m/s.the first at angle of 55 degree and second at 40 degree with respect to horizon.find the time interval between two fires such that two shells can collide in mid year.

Pulling a body is easier or pushing. Why?

A particle of mass m moves with constant speed v on a circular path of radius r . Find magnitude of average force on it in half revolution.

A person walks 29 m East and then walks 38 m at an angle 45◦ North of East.
What is the magnitude of the total displacement?

A light string passing over a smooth light pulley connects two blocks of masses m1 and m2 .if the acceleration of the system is g/8, then find the ratio of their masses.

two ball beraing of mass m each in opp. direction withe outh equal speed v collide head on with each other . peridict the outcomeof the collision assuming it to be perfectly elastic?

A truck cover a distance of 360 km in 5 hours . Find its speed in meter per second.