Mechanics | Relativity Answers

a ball is thrown with a speed of 3.0m/s horizontally from the top of a cliff 9.80 m high. Determine the time the ball is in the air before striking the ground.

A particle is moving eastward with velocity 5m/s. In 10s the velocity changes to 5m/s northwards. Calculate the average acceleration in this time and the direction.

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a swimmer wants to reach to a point just opposite on the other bank of the river. how should he swim and why?

a car is moving along a line y=x at 10m/s . find component of velocity vector on the vector i+j+k
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A body A of mass 1kg is placed at a distance of 2m from another of mass 10kg.At what distance from A another body of mass 5kg must be placed so that the net gravitational force on A is zero.

A 10000 kg truck travelling at 5.5 m/s along a straight level road rear ends a 1300 kg
passenger vehicle travelling at 2.2 m/s in the same direction. If the coefficient of restitution
between the two vehicles is 0.4 determine the velocity of each vehicle immediately after
impact.

2 forces of 5N and 20N are acting on an object at angle of 120deg. between them find the resultant force and its direction.Find the 3rd force acting in body so that the body will move in x direction of cartesian plane

Water leaves a hose at a rate of 1.5 kg/s with a speed of 20 m/s and is aimed at the side of a car which stops it. Assuming no splashing back, what is the force exerted by the water?

a force of 20N is directed from (1,2,3) to (2,2,4). experss force as a vector in terms of unit coordinate vector.