Question

find the solution of these question​

Answer 1

Answer:

Option (1) is correct.

Step-by-step explanation:

Whenever the boy throws a ball towards the trolley, momentum comes into play.

Momentum refers to the motion contained in a known mass.

[ Momentum of a body = mass x velocity of that body ]

Mass of trolley = 20 kg

Mass of one ball = 5 kg

Velocity of ball = 20 m/s

Let the required number of balls be a.

On observing, we can say :

= > momentum of a balls = momentum of trolley{ with velocity 10 m/s }

= > ( 5 kg x 20 m / s ) till a times = 20 kg x 10 m / s

= > ( 5 x 20 )a = 20 x 10

= > a = 2

Hence the required number of balls is 2.

Answer 2

$\large \sf \red{Quick \: Answer}$