một người đứng trong thang máy đang đi lên nhanh dần với gia tốc bằng nửagia tốc rơi tự do (a = 0, 5g) . So với khi thang máy đứng yên, trọng lượng biểu kiến của người đó lúc này như thế nào

Achild throws a ball with an initial speed of 8.00 m/s at an angle of 40.0° above the horizontal. the ball leaves her hand 1.00 m above the ground. how long is the ball in flight before it hits the ground?

Agust of wind pushes a beach ball with a force of 9 newtons.the ball rolls 10 meters in 3 seconds. what is the power of the wind?

Aweather forecaster uses doppler radar to predict the track of a storm near the town of meadowlands. when the doppler signal is pointed at the storm from the town's center, the frequencies of the waves appear to be decreasing. what should the weather forecaster predict? a. that the storm will move around the edges of meadowlands without hitting the tosis center o b. that residents should be prepared, because it is impossible to know whether the storm will hit o c. that the storm is moving toward meadowlands and that residents should be prepared d. that the storm is moving away from meadowlands and is not likely to hit the town