Question

2. A boy kicks the football of mass 500 g which is initially at rest. It starts moving with a
constant velocity of 5 m/s?. Calculate:
(a) the kinetic energy of the boy
(b) the work done by the boy
[Ans.(a) 6.25 J, (b) 6.25 ]]​

Answer 1

Answer:

ബ്സ്‌നസ്‌സ്ജ്ഫി സ്‌സ്ജ്സ്

Explanation:

ഹക്സിസ്‌സ്ഗ്ദ്സ്ജ്സ്ജെസി ഉഫിഫോ ഫ്കിഫ്

Answer 2

Given, initial speed of ball, u=0;

final speed of ball, v=10m/s;

mass of the ball, m=250g=(250/1000)kg

=0.25kg

Work done by the player on the ball,

W=changeinkineticenergy(E

k

)oftheball

or W=

2

1

mv

2

−

2

1

mu

2

=

2

1

(0.25)(10)

2

−

2

1

(0.25)(0)

2

=12.5J