JEE Main 2021 (Online) 22th July Evening Shift | Work Power & Energy Question 63 | Physics

A porter lifts a heavy suitcase of mass 80 kg and at the destination lowers it down by a distance of 80 cm with a constant velocity. Calculate the work done by the porter in lowering the suitcase.

(take g = 9.8 ms^$$-$$2)

+627.2 J

$$-$$62720.0 J

$$-$$627.2 J

784.0 J

JEE Main 2021 (Online) 20th July Evening Shift

MCQ (Single Correct Answer)

-1

A body at rest is moved along a horizontal straight line by a machine delivering a constant power. The distance moved by the body in time 't' is proportional to :

$${t^{{3 \over 2}}}$$

$${t^{{1 \over 2}}}$$

$${t^{{1 \over 4}}}$$

$${t^{{3 \over 4}}}$$

JEE Main 2021 (Online) 18th March Morning Shift

MCQ (Single Correct Answer)

-1

A constant power delivering machine has towed a box, which was initially at rest, along a horizontal straight line. The distance moved by the box in time 't' is proportional to :-

t^2/3

t^3/2

t^1/2

JEE Main 2021 (Online) 17th March Morning Shift

MCQ (Single Correct Answer)

-1

A boy is rolling a 0.5 kg ball on the frictionless floor with the speed of 20 ms^-1. The ball gets deflected by an obstacle on the way. After deflection it moves with 5% of its initial kinetic energy. What is the speed of the ball now?

14.41 ms^$$-$$1

19.0 ms^$$-$$1

4.47 ms^$$-$$1

1.00 ms^$$-$$1

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