Physics Question 4

From a motionless helicopter a parachute jumper jumps with a motionless position (which means that the velocity is 0ms-1). He tries to open the parachute, but it does not open in the needed moment. There is a vehicle with a metros for his safety stopped 500m away from the point he is about to fall. At this particular  moment the vehicle's machines show that he is falling at a velocity of 10ms-1 and is 600m up from the ground.
(Consider that the vehicle can stop immediately at any location it wishes to, the resistance of the air is zero and the gravitational acceleration is 10ms-2)

At the particular moment the vehicle starts moving. To come to the place where the parachute jumper is about to fall what has to be the minimum constant acceleration of the vehicle?   

Physics Question 3

From a helicopter situated 600m of height from the earth, a bomb is slightly dropped to the ground. A soldier sees this in the very moment and he straight away fires a rifle bullet, which is velocity is 120ms-1.

1. What is the time taken for the bullet to hit the bomb?
2. When the two impacts what is the height to them from the earth?
3. If the bullet rifle didn't hit the bomb, after another two seconds, he fires again in the same velocity. When it hits the bomb what is the height for the bomb from earth?
4. If the bullet didn't hit the bomb as in the third question, after two seconds the soldier runs at a speed of 7ms-1. When the bomb fall on the ground how long can the soldier run?

Physics Question 2

When a balloon that travels directly upwards is 20m high from the ground, it's velocity is 5ms-1. At this moment a thing is released downward from it.

1. After 1s and 2s, what are the positions(from the ground) and the velocities of the thing?
2. After how long will the it hit the ground? And at what speed?

Physics Qustion 1

Two cars are traveling one after another in a straight, flat road in a velocity of 90kmh-1. The car going in front suddenly slows down in a deceleration of 7.5ms-2. The car coming behind starts slowing down 0.5s later.  That car's deceleration is 6ms-2. To avoid hitting each another, what is the distance there should be between the two cars, when the car in front starts slowing down?