You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard VII

Physics

Energy

A player kick...

Question

A player kicks a ball of mass 250 g at the centre of a field. The ball leaves his foot with a speed of 10 m/s. Find the work done by the player on the ball.

10.5 J

No worries! We‘ve got your back. Try BYJU‘S free classes today!

12.5 J

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

1.5 J

No worries! We‘ve got your back. Try BYJU‘S free classes today!

2.5 J

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B $12.5 J$
Given, initial speed of ball, $u = 0$ ;
final speed of ball, $v = 10 m / s$ ;
mass of the ball, $m = 250 g = (250 / 1000) k g$
$= 0.25 k g$
Work done by the player on the ball,

$W = c h a n g e i n k i n e t i c e n e r g y (E_{k}) o f t h e b a l l$

or $W = \frac{1}{2} m v^{2} - \frac{1}{2} m u^{2}$

$= \frac{1}{2} (0.25) (10)^{2} - \frac{1}{2} (0.25) (0)^{2} = 12.5 J$

Suggest Corrections

Similar questions

Q. A player kicks a football at an angle of

45^{\circ}

with a velocity of

30 m s^{- 1}

. A second player

120 m

away along the direction of kick starts running to receive the ball at that instant. Find the speed with which second player should run to reach the ball before it hits the ground

(g = 10 m s^{- 2})

Q. A soccer player kicks a ball so that the ball leaves the ground at an angle of

35^{\circ}

above the horizontal and lands on the ground

25

meters away. Determine the speed at which the ball left the ground. (in m/s)

Q. A player kicks a football at an angle of

45^{\circ}

with a velocity of

20 m s^{- 1}

. A second player on the goal line

60 m

away in the direction of kick starts running to receive the ball at that instant. Find the speed

(m / s)

of the second player with which he should run to strike the ball before it strikes the ground

(g = 10 m s^{- 2})

Q. A football player kicks a 0.5 kg ball and imparts it a velocity of 10 m/s. The contact between foot and ball is only for 1/50th of a second. The kicking force is?

A player kicks a football at an angle of $45^{\circ}$ with a velocity of $20 m s^{- 1}$ . A second player $60 m$ away along the direction of kick starts running to receive the ball at that instant. Find the speed with which second player should run to reach the ball before it hits the ground $(g = 10 m s^{- 2})$

Join BYJU'S Learning Program

A player kicks a ball of mass 250 g at the centre of a field. The ball leaves his foot with a speed of 10 m/s. Find the work done by the player on the ball.

The correct option is B 12.5JGiven, initial speed of ball, u=0;final speed of ball, v=10m/s;mass of the ball, m=250g=(250/1000)kg =0.25kgWork done by the player on the ball,W=changeinkineticenergy(Ek)oftheballor W=12mv2−12mu2 =12(0.25)(10)2−12(0.25)(0)2=12.5J