Answer:
Va is two times greater than Vb
Explanation:
The maximum height reached by the balls are:

Since we are told that Ya = 4Yb:

Simplifying the equation:


<span>So we want to know how much work is needed to move a charge Q=3C for a distance r=0.01m trough a potencial difference U=9V. Work of electric potential is defined as W=Q*U and we can now simply put in the numbers. We get: W=3C*9V=27J. So the correct answer is (2) 27J. </span>
Answer:
Velocity after collision will be 20 m/sec
Explanation:
We have given mass of arrow 
Mass of arrow 
Mass of apple 
Apple is at rest so velocity of apple 
According to conservation of momentum
Momentum before collision is equal to momentum after collision



v = 20 m/sec
Answer:
b I think. sorry if it's wrong
Answer:
Acceleration is 8.45 and the tension is 2.775
Explanation:
Lets apply the equation F=ma for vertical block,
5-T= 0.5a
foe the frictional force acting on the object,
f=0.11×5 (consider equation no.1)
=0.55N
Applying F=ma for the block which is on surface,
T-0.55=0.5a (consider as equation no.2)
no.1=no.2
5.55=2T
T=2.775
by equation no.1,
4.225=0.5a
a=8.45