Friday

November 28, 2014

November 28, 2014

Posted by **tanya** on Wednesday, December 2, 2009 at 7:57pm.

a.) on a second run , the sled starts with a speed of 1.5 m/s at the top.. will it end with less than 9 m/s, 9 m/s, or more than 9 m/s

b.) find the speed of the sled at the bottom of the hill after the second run

- physics -
**drwls**, Wednesday, December 2, 2009 at 9:04pmBefore trying to answer (a), let's do (b).

Due to the starting kinetic energy, the KE at the bottom will be increased from

(1/2)M(7.5)^2 to (1/2)M[(1.5)^2 + (7.5)^2] = (1/2)M(58.5) = (1/2)M(7.64)^2

The velocity at the bottom in the second case will be 7.64 m/s.

**Answer this Question**

**Related Questions**

physics - A child and a sled have a combined mass of 87.5 kg slides down a ...

Physics - A sled starts from rest at the top of a hill and slides down with a ...

physics - You are pulling your sister on a sled to the top of a 20.0 m high, ...

physics - A child and sled with a combined mass of 48.4 kg slide down a ...

physics - A child and sled with a combined mass of 47.4 kg slide down a ...

physics - A child and sled with a combined mass of 53.0 kg slide down a ...

physics - A child and sled with a combined mass of 47.8 kg slide down a ...

physics - A child and sled with a combined mass of 40.0 kg slide down a ...

physics - A child and sled with a combined mass of 40.0 kg slide down a ...

Physics URGENT!!! - Gayle runs at a speed of 9.00 m/s and dives on a sled, ...