A hockey ball of mass 200 ,g travelling at 10 | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) Mass of the hockey ball,$m = 200 \,g = 0.2 \,kg$.Initial velocity of the hockey ball,$u = 10 \,m \,s^{-1}$.Initial momentum,$p_i = m 	imes u = 0.

Vedclass · Accepted Answer

$3 \,kg \,m \,s^{-1}$

Vedclass · Answer

(B) Mass of the hockey ball,$m = 200 \,g = 0.2 \,kg$.Initial velocity of the hockey ball,$u = 10 \,m \,s^{-1}$.Initial momentum,$p_i = m 	imes u = 0.2 \,kg 	imes 10 \,m \,s^{-1} = 2 \,kg \,m \,s^{-1}$.Since the ball returns along its original path,the final velocity is in the opposite direction,$v = -5 \,m \,s^{-1}$.Final momentum,$p_f = m 	imes v = 0.2 \,kg 	imes (-5 \,m \,s^{-1}) = -1 \,kg \,m \,s^{-1}$.Change in momentum,$\Delta p = p_f - p_i = -1 \,kg \,m \,s^{-1} - 2 \,kg \,m \,s^{-1} = -3 \,kg \,m \,s^{-1}$.The magnitude of the change in momentum is $|\Delta p| = 3 \,kg \,m \,s^{-1}$.

Time in seconds	Distance in metres
$0$	$0$
$1$	$1$
$2$	$8$
$3$	$27$
$4$	$64$
$5$	$125$
$6$	$216$
$7$	$343$

$A$ hockey ball of mass $200 \,g$ travelling at $10 \,m \,s^{-1}$ is struck by a hockey stick so as to return it along its original path with a velocity of $5 \,m \,s^{-1}$. Calculate the magnitude of the change in momentum of the hockey ball due to the force applied by the hockey stick.

Similar Questions

If action is always equal to the reaction,explain how a horse can pull a cart.

Which of the following has more inertia: $(a)$ a rubber ball and a stone of the same size? $(b)$ a bicycle and a train? $(c)$ a five-rupee coin and a one-rupee coin?

From a rifle of mass $4\, kg$,a bullet of mass $50\, g$ is fired with an initial velocity of $35\, m\, s^{-1}$. Calculate the initial recoil velocity (in $m/s$) of the rifle.

Vedclass Test Series

Exam Paper Generator

Online Exam Module