Motion under Gravity

Q. What is acceleration due to gravity? Justify that all objects (hollow or solid, big or small) fall from a height near the earth's surface at the same rate in vacuum.

Q.

A ball is thrown vertically upward. The acceleration due to gravity

1. in the direction opposite to the direction of motion

2. in the direction same as the direction motion

3. increases as it comes down

4. becomes zero at the highest point

Q. The acceleration due to gravity is negative for the bodies falling freely under the Earth's gravitational pull.

1. True
2. False

Q. The acceleration due to gravity is for an object falling near Earth's surface.

1. zero
2. non-uniform
3. uniform

Q. The acceleration due to gravity is negative for the bodies falling freely under the Earth's gravitational pull.

1. True
2. False

Q.

A body falls freely towards the earth with

1. uniform speed

2. uniform velocity

3. uniform acceleration

4. none of these

Q.

If we drop three watermelons weighing $2kg$, $4kg$ and $6kg$ respectively from the same height and at the same time, which one of it will reach the ground first? (Given: negligible air resistance)

1. Watermelon weighing $2kg$

2. Watermelon weighing $4kg$

3. Watermelon weighing $6kg$

4. All three will reach at the same instant.

Q. Whenever we throw ball in upward direction, it falls back to the ground under the Earth's gravity. In fact all objects near the Earth's surface fall with a constant acceleration of $9.8m{s}^{-2}$.

1. True
2. False