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LEVEL-I 1 An object of mass 5 kg falls from rest through a vertical distance of 20 m and attains a velocity of 10 m/s. How much work is done by the resistance of the air on the object? (g = 10m/s). 2. A train of mass 100 metric tons is drawn up an incline of 1 in 49 at the rate of 36 km per hour by an engine. If the resistance due to friction be 10 N per metric ton, calculate the power of the engine. If the steam is shut off, how far will the train move before it comes to rest? 3. Shown in the figure is a smooth vertical frame of wire along which a small bead moves from the point A. Find its speed at the point B. 4. A rubber ball after falling through a height h penetrates into the water through a distance x. Find the average force imparted by water on the rubber ball in ideal conditions

5. A bus of mass 1000 kg has an engine which produces a constant power of 50 kW. If the resistance to motion, assumed constant is 1000 N, find the maximunm speed at which the bus can travel on level road and the acceleration when it's travelling at 25 m/s. 6. A particle of mass m is projected up the smooth inclined plane of inclination with a speed vo. (>y2gl sin ) as shown in the figure. Find the maximum height travelled by the particle. 7. A block of mass m collides with a horizontal weightless spring of force constant k. The block compresses the spring by x. Calculate the maximum momentum of the block. 8. Prove that K. E. of two identical trains with respect to heliocentric frame of reference moving in opposite directions on equatorial line with same speed (w.r.t earth) are not equal.

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Adarsh Raj

Teaching Physics for IIT JEE /NEET.
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Vutharadi Reddy Rajeshwari

9 months ago

well said sir.....
great command in history

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Sherley daniel

6 months ago

The answer for qn 1 is 250 cause according to work energy theorem the kinetic energy of the body is equal to the amount of work done on the body. thus work done by air friction is 250.i hope it is right

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Deepthi Deepu

2 years ago

give me the solutions of assignment

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Adarsh Raj

2 years ago

firstly u have to solve the assignment and give me the answer to review

Harshal Pawar

2 years ago

sir is first answer 75

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Adarsh Raj

2 years ago

good job

Deepthi Deepu

2 years ago

q 1:ans- 1000N
is it correct sir

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Adarsh Raj

2 years ago

no the answer is wrong,, as the body was at height it has some potential energy and it is converted in to kinetic as well as loss of energy due to resistance of air...
so ACC to conservation of energy
PE = KE + LOSS.....

Vikesh Kumar

2 years ago

give solution of assignment

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