# CHILD DEVELOPMENT PEDAGOGY

## GROWTH DEVELOPMENT CHILD

### SUMMATIVE ASSESSMENT

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The velocity of a 975-kg car is changed from 12.0 m/s to 27.0 m/s in 15s by an external, constant force. What is the magnitude of the force?
 A 780 N B 975 N C 1, 755 N D 14, 625 N E none of the above
Explanation:

Detailed explanation-1: -The velocity of a 975-kg car is changed from 12.0 m/s to 27.0 m/s in 15s by an external, constant force.

Detailed explanation-2: -The SI unit of impulse is Newton-seconds. It is abbreviated as N s. 1 N s is the same as 1 kg m/s.

Detailed explanation-3: -Impulse of force is the product of the resultant force F and the duration of this force t, if the force is constant. Impulse of force is the cause of changes to motion and therefore changes to momentum.

Detailed explanation-4: -The SI unit of impulse is the newton second (N⋅s), and the dimensionally equivalent unit of momentum is the kilogram meter per second (kg⋅m/s).

There is 1 question to complete.