Question

The work done by a fielder when he takes a catch in a cricket match,is negative. Explain in nearly 60 words. Urgent....

Answer 1

HI NeneAmano !!

We know that ;

Work done = Force × Displacement

Here ; the displacement and the force applied are in the opposite direction.
When this happens  , work done is always negative .

The force applied by the fielder is opposite to the displacement of the ball .

Answer 2

NEWTONS SECOND LAW states that the rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of force.

The second law of motion gives us a method to measure the force acting on an object as a product of its mass and acceleration.

i.e:- F = ma . ( force = mass × acceleration )

while catching a fast moving cricket ball, a fielder in the ground gradually pulls his hands backwards with the moving ball. In doing so, the fielder increases the time during which the high velocity of the moving ball decreases to zero. Thus, the acceleration of the ball is decreased and therefore the impact of catching the fast moving ball is also reduced. If the ball is stopped suddenly then its high velocity decreases to zero in a very short interval of time. Thus, the rate of change of momentum of the ball will be large. Therefore, a large force would have to be applied for holding the catch that may hurt the palm of the fielder.