A bus is travelling south at 20 m.s-1 when the driver sees a child run in front of the bus. The bus driver applies the brakes and the bus stops in time. Which is the best description of the velocity and acceleration of the bus after the brakes are applied?
north | south | |
|---|---|---|
Velocity | ||
Acceleration |
A small aeroplane is able to accelerate from rest to attain a high enough speed for take-off, on a runway that is 150 m long. A second aeroplane, which is heavily loaded, can accelerate from rest with the same acceleration but needs twice the speed to take off. What is the minimum length of runway that will be needed for the heavy plane to take off?
The heavier aeroplane needs a runway with a length of meters.
The velocity vs time graph for the motion of a car on a straight road is shown in the graph. Assume that the car starts at the origin 𝓍 = 0 at time t = 0.
The car's initial velocity is east.
At 10 s is the car's position east or west from its starting point?
When a ball is thrown vertically upwards, and then caught again, at what point does its velocity become zero?
A ball is thrown vertically upwards.
Which ONE of the following physical quantities has a non-zero value at the instant the ball changes direction?
A stone P is thrown vertically upwards with a speed 𝓋 from the top of a building.
At the same time, a stone Q is thrown vertically downwards with the same speed 𝓋.
Air resistance can be ignored. Complete the following statement regarding the relative speeds at which the stones hit the ground.
The speed of Stone P is the speed of stone Q when they hit the ground.
At which point on the graph does the ball reach its maximum height after the first bounce?
Samuel hits the cricket ball from the ground straight up in the air.
A graph of velocity vs time was drawn.
Upwards is taken as positive.
Which of the following graphs represents the corresponding position vs time graph?
How many times does this ball bounce? Write the number value only.
During which time interval(s) is the car speeding up? Select all that may apply.
During which interval is the ball slowing down?
At which points is the ball in contact with the ground?
(Select all that may apply)
