The third direction through the same equation: an object carries momentum 90 kg·m/s at 15 m/s, and its mass is the question. One more rearrangement completes the set.
Start from p = mv.
Make m the subject: divide both sides by v. That gives m = p/v.
With p in kg·m/s and v in m/s, the mass comes out in kilograms.
After this lesson you own all three directions through p = mv; from here, the work is reading which quantity a question wants.
An object carries momentum 90 kg·m/s at a velocity of 15 m/s. Calculate its mass.
Write down the values:
p = 90 kg·m/s, v = 15 m/s, m = ?
Write down the equation:
m = p/v
Substitute in the values, and calculate:
m = 90 / 15 = 6.0
The object's mass is 6.0 kg.
A ball carries momentum 5.4 kg·m/s at 4.5 m/s. Calculate its mass.
Write down the values:
p = 5.4 kg·m/s, v = 4.5 m/s, m = ?
Write down the equation:
m = p/v
Substitute in the values, and calculate:
m = 5.4 / 4.5 = 1.2
The ball's mass is 1.2 kg.
A wagon carries momentum 44 kg·m/s at 4.0 m/s. Enter its mass in kg.
A cart carries momentum 150 kg·m/s at 2.5 m/s. Enter its mass in kg.
A ball carries momentum 10.5 kg·m/s at 3.5 m/s. Enter its mass in kg.
A truck carries momentum 2000 kg·m/s at 25 m/s. Enter its mass in kg.
A toy drone carries momentum 4.2 kg·m/s at 6.0 m/s. Enter its mass in kg.
A rowboat drifts at 1.5 m/s carrying momentum 270 kg·m/s. Enter the rowboat's mass in kg.
A sled carries momentum 58.5 kg·m/s at 4.5 m/s. Enter its mass in kg.
A motorboat carries momentum 352 kg·m/s at 2.2 m/s. Enter its mass in kg.
A shopping cart rolls at 2.4 m/s carrying momentum 42 kg·m/s. Enter the cart's mass in kg.