# If a #12 kg# object is constantly accelerated from #0m/s# to #4 m/s# over 7 s, how much power musy be applied at #t=1 #?

##### 2 Answers

#### Explanation:

**Given**: Object mass,

**Required**: Power applied or use up at

**Solution Strategy**:

a) Kinematic equation to determine the acceleration:

b) Find the kinetic energy at any timer

c) Calculate Power using:

#### Explanation:

For constant acceleration, the kinematic expression between velocity, acceleration and time is

or

We know that Force

or

It is given that during the period acceleration is constant.

Implies that force is also constant during the period.

Let the object move through a distance

Work done

Power applied

Power applied at