Question

PLEASE ANSWER THE FOLLOWING QUESTIONS
1. What is a fielder pull his arms back while trying to stop or catch a cricket ball
2.Why does a fall on a hard concrete Road or floor hot more than wall on a Sandy surface
3.why does a Karate player break up pile of tiles or a slab of ice in a single blow
4.why does a boxer move his head backward to minimise the effect of an coming punch.
NUMERICAL PROBLEMS
An automobile vehicle has a mass of 1500 kg what must be the force between the vehicle and road if the vehicle is to be stopped with the negative acceleration of 1.7 metre per second square
5. hammer of 500 gram mass moving at 50 metre per second strikes a nail the nail stops the hammer in a very short time equal to 0.01 second what are the force of nail on the hamme​

Answer 1

Answer:

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Explanation:

1. to increase time and thereby reducing the velocity or speed of the ball.

2. the concrete floor is hard, a a fall on it is abruptly stopped in short interval of time and there is a sudden change in momentum so the man will get hurt.

3. the player strikes the ice slab in a single blow and it is a very fast process so it causes a large amount of momentum and is reduced to 0 when hand reaches tiles.

4.m=1500kg

a=-1.7m/s

f=ma

1500*-1.7

-2550N