## A soldier fires a bullet of mass 200 g from a gun of mass 5 kg. The bullet leaves the gun with a velocity of 100 m/s. Find the average force exerted on the gun given that the recoil of the gun lasted for 2 seconds.

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3 months 0 Answers 25 views

## A body of mass 8 kg moving with a velocity of 20 m/s collides with another body of mass 4 kg moving with a velocity of 10 m/s in the same direction. The velocity of the 8-kg body is reduced to 15 m/s after the collision. If the bodies don’t stick together after the collision, calculate the final velocity of the 4-kg body.

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3 months 0 Answers 32 views

## A car of mass 500kg is moving in a straight line with a velocity of 90 km/h. Calculate the linear momentum of the car.

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3 months 0 Answers 24 views

## Two cars A and B start moving at the same time along a straight line with uniform accelerations of 5 m/s² and 3 m/s² , respectively. If A is 60 km behind B, after how long will car A overtake car B?

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3 months 0 Answers 28 views

## Define the terms acceleration and deceleration.

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3 months 0 Answers 13 views

## A man walks a distance of 30 km in 5 hours. Calculate his average speed in SI units.

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3 months 0 Answers 13 views

## The cheetah is the fastest animal over short distances. A book says that a cheetah can run at a speed of 96 km/h. How long would it take for a cheetah to run 50 m?

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3 months 0 Answers 14 views

## While using a machine,a man had to apply a force of 2000 N through a distance of 1.0 m in order to lift up a load of 1500 N through a height of 1.0 m. Find: (i) the work put into the machine; (ii) the work done by the machine; (iii) the efficiency of the machine.

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3 months 0 Answers 15 views

## A car of mass 980 kg is to be lifted by a screw jack of pitch 6.3 mm. If the effort handle is 0.9 m long and the efficiency of the machine is 36%, what force must be applied to the machine? (The force of gravity is 9.8 N/kg.)

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3 months 0 Answers 18 views

## What is meant by the pitch of a screw?

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3 months 0 Answers 8 views