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Physics problems: kinematics

Part 12

 

Problem 111.

A soccer player kicks a ball so that the ball leaves the ground at an angle of 35 degrees above the horizontal and lands on the ground 25 meters away. Determine the speed at which the ball left the ground.

Solution

 

Problem 112.

A body is thrown vertically up from the ground with a speed time and it reaches maximum height h at time initial. What is the height to which it would have risen at time

Solution

 

Problem 113.

Two locomotives approach each other on the parallel tracks. Each has speed of 95 km/h with respect to the ground. If they are initially 8.5 km apart, how long will it be before they reach each other?

Solution

 

Problem 114.

An object has an initial speed of 8.0 m/s and is stopped in intervals of 0.20 s. What is the magnitude and direction of his acceleration.

Solution

 

Problem 115.

Two boys are racing for chocolates. The older one has a speed of 1 m/s and the younger one has a 0.5 m/s. The older one told the younger one to run first, which the younger one does. Ten seconds later the older one follows. How far would they be from the starting line for the older one to overtake the younger one?

Solution

 

Problem 116.

A car was traveling at 12m/s when the driver stepped on the brakes. If the car comes to a full stop in 5.0 s, what was its acceleration? What distance did it cover?

Solution

 

Problem 117.

Brakes applied to a car produce a uniform retardation of acceleration. If the car was travelling with a velocity of 27 m/s, what distance will it cover before coming to rest?

Solution

 

Problem 118.

A swimmer can swim at 2 m/s. He sets out to swim across a 150 m wide river which is flowing East at 3 m/s. He swims in a northerly direction. find the direction he will travel and velocity in that direction.

Solution

 

Problem 119.

A particle has  velocity velocity and its acceleration is acceleration at that moment of time. Find the rate of change of particle’s speed.

Solution

 

Problem 120.

A car travels along a straight line. For the first half it travels 20 km/h and for second half it travels 50 km/h. What is the mean speed of that car?

Solution

 

 

 

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