Question

what minimum speed does a 160 kg puck need to make it to the top of a 3.00 m long 27.0 degree frictioneless ramp?

Answer 1

▪︎ Givens :

• v_f = 0

• = 27°

• m_puck = 160 kg

• d_ramp = 3 m

• The ramp is frictionless.

• Because the ramp is frictionless, we can consider the puck and the Earth as an isolated system.

Because there is no energy comes in or out of the system, we can use the conservation of energy principle.

Note that the initial altitude is zero.

y_i = 0

Note that y_f = h

(multiplying each side by 2)

Note that v_f = 0

Now we are going to find the final altitude h,

We have,

  

  

Substitute this value in (1),

= 5.2 m/s