JEE Main · Physics

Work, energy and power

25 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 25 questions

A body of mass $4 kg$ falls freely from rest through a height of $5 m$ . What is its speed on reaching the ground? (take $g = 10 m/s^{2}$ , answer in m/s)
A body of mass $5 kg$ falls freely from rest through a height of $80 m$ . What is its speed on reaching the ground? (take $g = 10 m/s^{2}$ , answer in m/s)
What is the kinetic energy (in J) of a $10 kg$ body moving at $2 m/s$ ?
What is the kinetic energy (in J) of a $5 kg$ body moving at $6 m/s$ ?
A body of mass $5 kg$ falls freely from rest through a height of $20 m$ . What is its speed on reaching the ground? (take $g = 10 m/s^{2}$ , answer in m/s)
What is the kinetic energy (in J) of a $2 kg$ body moving at $2 m/s$ ?
A body of mass $1 kg$ falls freely from rest through a height of $5 m$ . What is its speed on reaching the ground? (take $g = 10 m/s^{2}$ , answer in m/s)
What is the kinetic energy (in J) of a $10 kg$ body moving at $6 m/s$ ?
What is the kinetic energy (in J) of a $2 kg$ body moving at $4 m/s$ ?
What is the kinetic energy (in J) of a $2 kg$ body moving at $6 m/s$ ?
What is the kinetic energy (in J) of a $4 kg$ body moving at $4 m/s$ ?
A body of mass $2 kg$ falls freely from rest through a height of $80 m$ . What is its speed on reaching the ground? (take $g = 10 m/s^{2}$ , answer in m/s)
What is the kinetic energy (in J) of a $5 kg$ body moving at $4 m/s$ ?
A $0.5 kg$ block slides from rest down a smooth curved track from a height of $2 m$ . At the bottom it crosses a rough horizontal patch $1.6 m$ long (coefficient of friction…
A uniform chain $2 m$ long lies on a smooth horizontal table with $0.5 m$ of it hanging over the edge, and is released from rest. Taking $g = 10 m/s^{2}$ , what is the speed of the…
A $2 kg$ block is released from rest at a height $1.3 m$ on a smooth curved track. At the bottom it crosses a rough horizontal patch of length $2 m$ ( $μ = 0.25$ ), then compress…
A body of mass $4 kg$ falls freely from rest through a height of $20 m$ . What is its speed on reaching the ground? (take $g = 10 m/s^{2}$ , answer in m/s)
A body of mass $2 kg$ falls freely from rest through a height of $5 m$ . What is its speed on reaching the ground? (take $g = 10 m/s^{2}$ , answer in m/s)
What is the kinetic energy (in J) of a $4 kg$ body moving at $3 m/s$ ?
A body of mass $2 kg$ falls freely from rest through a height of $45 m$ . What is its speed on reaching the ground? (take $g = 10 m/s^{2}$ , answer in m/s)
A body of mass $4 kg$ falls freely from rest through a height of $80 m$ . What is its speed on reaching the ground? (take $g = 10 m/s^{2}$ , answer in m/s)
A body of mass $1 kg$ falls freely from rest through a height of $45 m$ . What is its speed on reaching the ground? (take $g = 10 m/s^{2}$ , answer in m/s)
What is the kinetic energy (in J) of a $4 kg$ body moving at $2 m/s$ ?
A body of mass $5 kg$ falls freely from rest through a height of $5 m$ . What is its speed on reaching the ground? (take $g = 10 m/s^{2}$ , answer in m/s)
A body of mass $2 kg$ falls freely from rest through a height of $20 m$ . What is its speed on reaching the ground? (take $g = 10 m/s^{2}$ , answer in m/s)

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