@alexrobin13 In which situation is the acceleration of the car negative?

A)
The velocity of a car was 75 km/h over 4 hours.

B)
The velocity of a car reduced from 50 km/h to 35 km/h over one minute.

C)
The velocity of a car increased from 40 km/h to 75 km/h over 15 minutes.

D)
The velocity of a car was 45 km/h at 2:00 pm and at 4:00 pm the velocity of the car was 85 km/h.

Question

@alexrobin13 In which situation is the acceleration of the car negative?
	

A)
	The velocity of a car was 75 km/h over 4 hours. 	
	

B)
	The velocity of a car reduced from 50 km/h to 35 km/h over one minute. 	
	

C)
	The velocity of a car increased from 40 km/h to 75 km/h over 15 minutes. 	
	

D)
	The velocity of a car was 45 km/h at 2:00 pm and at 4:00 pm the velocity of the car was 85 km/h.

alexrobin13 · Answer

B

a=deltav/deltat
a=(35-50)/1
a=-15km/m