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Question No 1:
Question No 2:
Question No 3:
With the same Momentum
Because Momentum = Mass of the body X Velocity of the body
If we assume that mass of base ball is mb and Velocity of base ball is v. So we can judge that the mass of Iron ball mi is 10mi. We know the formula of Momentum.
Momentum of Base Ball = mb X v.
Momentum of Iron Ball = 10mi X v.
Required Momentum for Iron ball is mi X-1.
So the velocity of the iron ball is 1/10 of the velocity of baseball.
The same kinetic energy
Because this will also decrease the velocity of Iron ball thrown by Sports instructor.
The Same Speed as base ball
Because if the speed is same and mass 10 times heavier than the momentum will also be 10 times higher than momentum of the baseball.
Question No 4:
Velocity is not constant. Velocity is constant when it is neither changing speed nor direction. But in this case direction is changing constantly. So in this case Velocity of Car is not constant.
B: Statement is wrong.
Direction of its velocity is tangent line of the circle.
Whereas direction of the acceleration of the body is center of the circle.