12. Two forces are applied to a car in an effort to move it, as
shown in Figure P4.12. (a) What is the resultant of these
two forces? (b) If the car has a mass of 3 000 kg, what
acceleration does it have? Ignore friction.
1300
450 Ni400 N

the answer is b ) square root of 5

pecialized keyboards

the design of a ski jumping suit involves a trade-off between giving the skiers lift to get higher jumps and ensuring the skier does not face a lot of drag before the jump itself. an expansive suit may to lift the skier higher, but at the same time, it will also increase the air resistance. higher air resistance as the skier goes down the slope limits the speed of the jump. a big suit also increases the risk of losing balance or control, especially if there's a strong gust of wind. while technologically enhanced suits a lot, clothing is not the only factor in a ski jumper’s success. gathering speed while skiing down the slope, ensuring good speed on the ramp, and maintaining good body posture and form in the air all contribute to a ski jumper's success.