Question 1

Find the speed  a $2.1×10^{​5}​ kg$ airplane need to fly to have a momentum of $4.6 ×10^{7}​ ​kgms^{-1}$

Accepted Answer

230kg

Answer

210kg

Answer

220kg

Answer

200kg

Question 2

A car has mass 3,000kg, find the momentum of the car when it is off at a speed of $60ms^{-1}$

Accepted Answer

$1.8	imes10^{5}$

Answer

$4.8	imes10^{5}$

Answer

$2.8	imes10^{5}$

Answer

$3.8	imes10^{5}$

Question 3

A professional boxer hits his opponent with a 1200-N horizontal blow that lasts for 0.15 s. Calculate the change n momentum.

Accepted Answer

$\Delta\rho=180kgms^{-1}$

Answer

$\Delta\rho=380kgms^{-1}$

Answer

$\Delta\rho=280kgms^{-1}$

Answer

$\Delta\rho=480kgms^{-1}$

Question 4

The change of momentum on and object is $200kgms^{-1}$, it has a mass of 40kg and starts from rest .
Find its final velocity.

Accepted Answer

$5ms^{-1}$

Answer

$3ms^{-1}$

Answer

$4ms^{-1}$

Answer

$6ms^{-1}$

Question 5

Find the velocity of the two cars shown after the collision given they collide and move as one after the collision.

Accepted Answer

$2ms^{-1}$

Answer

$3ms^{-1}$

Answer

$4ms^{-1}$

Answer

$1ms^{-1}$

Question 6

What happens to the shaded ball shown after the collsion?

Accepted Answer

It stops moving ($0ms^{-1}$)

Answer

It reverses direction ($-1ms^{-1}$)

Answer

It reverses direction and speeds up ($-5ms^{-1}$)

Answer

It follows the same  direction 
($1ms^{-1}$)

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