A car starts from rest with an acceleration of 6
which decreases linearly with time to zero in 10 seconds, after which the car continues at a constant speed. Determine the time t required for the car to travel 400 m from the start.

Explanation:

From the question, acceleration from in 10 seconds.

Acceleration function can be written as:-

From the acceleration equation, we can obtain the velocity equation:

We calculate velocity after 10sec from the above v(t) as .

To obtain distance travelled after 10 seconds:-

Therefore 200m is for 10seconds, and next 200m at 30m/s

Total time=

answer: a ball

explanation: because it will bounce

answer: a) y=-8x+5

a) m= -8

b) m= -2

c) m= 7

d) m= 6