AS chapter 1-2

A object is released from rest and falls freely（下落） for 10m high until reaching the ground. What is time for this process?

• 2

• 1.4

• 2.4

• 1

A object is released from rest and falls freely （下落） for 4.00 𝑠 until reaching

ground. Select all correct answers.

• 末速度v_^f =0

• 初速度v_⁰ =0

• t=4s

• a is relate to g

• a is negative

A object is released from rest and falls freely for 4.00 𝑠 until reaching the

ground. What is the highest distance? （所有填空题均不要填写单位）

I ran west（西） for 30 metres, then east（东） for 40 metres. What is my displacement?

I ran a circle （跑了一整圈）and go back to initial point. What is my displacement?

The translation of '位移' into English is

• distance

• speed

• acceleration

• displacement

Which of the following properties does a scalar（标量） have?

• only magnitude

• only direction

• both magnitude and direction

• I dont know

Which one of the following choices is a vector quantity（向量）?

• average speed

• time

• mass

• acceleration

A ball is thrown upward（上抛） for 10s until reaching the highest point. Select all correct answers.

• t=10s

• v₀=0

• v_f=0

• a=10m/s

• 最高高度可以通过题目给出的条件算出来

A ball is thrown upward （上抛） for 10s until reaching the highest point. What is the initial velocity for ball?

• 100m/s

• 10m/s

• 0m/s

• -100m/s