Answer:
Kinetic Energy:120 x 15=1800
Explanation:
Answer:
Electric field, 
Explanation:
It is given that,
Mass of sphere, m = 2.1 g = 0.0021 kg
Charge, 
We need to find the magnitude of electric field that balances the weight of a plastic spheres. So,

a = g



or

Hence, the magnitude of electric field that balances its weight is
. Hence, this is the required solution.
I think the answer you are looking for is "Pure Colors"
Answer:
The velocity of the boat after Batman lands in it is 2.08 m/s.
Explanation:
Given that,
Mass of batman 
Mass of boat 
Initial velocity = 14.5 m/s
We need to calculate the velocity of boat
Using conservation of momentum
...(I)
Where,
=mass of batman
=mass of boat
u=initial velocity
v = velocity of boat
Put the value in the equation



Hence, The velocity of the boat after Batman lands in it is 2.08 m/s.