Will the ball stop
Classical Mechanics
Level
2
A car travels at 60 mph and ball is launched away at a 60 degrees. What speed can the ball be stationary on the x-axis immediately (or within 0.5s) without spin? (Note : does not need to be stationary at the y-axis)
This is not possible
The speed of ball needs to be 90 mph
The speed of ball needs to be 120 mph
This is only possible with spin
The speed of ball needs to be 60 mph
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The ball should be thrown opposite to direction of motion of car, it's been thrown at 60° to the horizontal, so the ball's velocity's horizontal component (vcos60°) should be 60m/s to cancel out the speed of the car. Hence, v=60×2=120